Add support for team notification configurations

[jfreda]

Description

This PR adds support for team notification configurations.

External links

• API documentation

Output from tests

$ ENABLE_BETA=1 go test ./... -run 'TestTeamNotificationConfiguration' -v
=== RUN   TestTeamNotificationConfigurationList
=== RUN   TestTeamNotificationConfigurationList/with_a_valid_team
    team_notification_configuration_integration_test.go:43: paging not supported yet in API
=== RUN   TestTeamNotificationConfigurationList/with_list_options
    team_notification_configuration_integration_test.go:49: paging not supported yet in API
=== RUN   TestTeamNotificationConfigurationList/without_a_valid_team
--- PASS: TestTeamNotificationConfigurationList (1.88s)
    --- SKIP: TestTeamNotificationConfigurationList/with_a_valid_team (0.15s)
    --- SKIP: TestTeamNotificationConfigurationList/with_list_options (0.00s)
    --- PASS: TestTeamNotificationConfigurationList/without_a_valid_team (0.00s)
=== RUN   TestTeamNotificationConfigurationCreate
=== RUN   TestTeamNotificationConfigurationCreate/with_all_required_values
=== RUN   TestTeamNotificationConfigurationCreate/without_a_required_value
=== RUN   TestTeamNotificationConfigurationCreate/without_a_required_value_URL_when_destination_type_is_generic
=== RUN   TestTeamNotificationConfigurationCreate/without_a_required_value_URL_when_destination_type_is_slack
=== RUN   TestTeamNotificationConfigurationCreate/without_a_required_value_URL_when_destination_type_is_MS_Teams
=== RUN   TestTeamNotificationConfigurationCreate/without_a_valid_team
=== RUN   TestTeamNotificationConfigurationCreate/with_an_invalid_notification_trigger
=== RUN   TestTeamNotificationConfigurationCreate/with_email_users_when_destination_type_is_email
=== RUN   TestTeamNotificationConfigurationCreate/without_email_users_when_destination_type_is_email
--- PASS: TestTeamNotificationConfigurationCreate (3.11s)
    --- PASS: TestTeamNotificationConfigurationCreate/with_all_required_values (0.15s)
    --- PASS: TestTeamNotificationConfigurationCreate/without_a_required_value (0.00s)
    --- PASS: TestTeamNotificationConfigurationCreate/without_a_required_value_URL_when_destination_type_is_generic (0.00s)
    --- PASS: TestTeamNotificationConfigurationCreate/without_a_required_value_URL_when_destination_type_is_slack (0.00s)
    --- PASS: TestTeamNotificationConfigurationCreate/without_a_required_value_URL_when_destination_type_is_MS_Teams (0.00s)
    --- PASS: TestTeamNotificationConfigurationCreate/without_a_valid_team (0.00s)
    --- PASS: TestTeamNotificationConfigurationCreate/with_an_invalid_notification_trigger (0.00s)
    --- PASS: TestTeamNotificationConfigurationCreate/with_email_users_when_destination_type_is_email (0.21s)
    --- PASS: TestTeamNotificationConfigurationCreate/without_email_users_when_destination_type_is_email (0.19s)
=== RUN   TestTeamNotificationConfigurationsCreate_byType
=== PAUSE TestTeamNotificationConfigurationsCreate_byType
=== RUN   TestTeamNotificationConfigurationRead
=== RUN   TestTeamNotificationConfigurationRead/with_a_valid_ID
=== RUN   TestTeamNotificationConfigurationRead/when_the_notification_configuration_does_not_exist
=== RUN   TestTeamNotificationConfigurationRead/when_the_notification_configuration_ID_is_invalid
--- PASS: TestTeamNotificationConfigurationRead (1.94s)
    --- PASS: TestTeamNotificationConfigurationRead/with_a_valid_ID (0.16s)
    --- PASS: TestTeamNotificationConfigurationRead/when_the_notification_configuration_does_not_exist (0.11s)
    --- PASS: TestTeamNotificationConfigurationRead/when_the_notification_configuration_ID_is_invalid (0.00s)
=== RUN   TestTeamNotificationConfigurationUpdate
=== RUN   TestTeamNotificationConfigurationUpdate/with_options
=== RUN   TestTeamNotificationConfigurationUpdate/with_invalid_notification_trigger
=== RUN   TestTeamNotificationConfigurationUpdate/with_email_users_when_destination_type_is_email
=== RUN   TestTeamNotificationConfigurationUpdate/without_email_users_when_destination_type_is_email
=== RUN   TestTeamNotificationConfigurationUpdate/without_options
=== RUN   TestTeamNotificationConfigurationUpdate/when_the_notification_configuration_does_not_exist
=== RUN   TestTeamNotificationConfigurationUpdate/when_the_notification_configuration_ID_is_invalid
--- PASS: TestTeamNotificationConfigurationUpdate (6.76s)
    --- PASS: TestTeamNotificationConfigurationUpdate/with_options (0.73s)
    --- PASS: TestTeamNotificationConfigurationUpdate/with_invalid_notification_trigger (0.00s)
    --- PASS: TestTeamNotificationConfigurationUpdate/with_email_users_when_destination_type_is_email (0.21s)
    --- PASS: TestTeamNotificationConfigurationUpdate/without_email_users_when_destination_type_is_email (0.20s)
    --- PASS: TestTeamNotificationConfigurationUpdate/without_options (0.39s)
    --- PASS: TestTeamNotificationConfigurationUpdate/when_the_notification_configuration_does_not_exist (0.14s)
    --- PASS: TestTeamNotificationConfigurationUpdate/when_the_notification_configuration_ID_is_invalid (0.00s)
=== RUN   TestTeamNotificationConfigurationDelete
=== RUN   TestTeamNotificationConfigurationDelete/with_a_valid_ID
=== RUN   TestTeamNotificationConfigurationDelete/when_the_notification_configuration_does_not_exist
=== RUN   TestTeamNotificationConfigurationDelete/when_the_notification_configuration_ID_is_invalid
--- PASS: TestTeamNotificationConfigurationDelete (2.22s)
    --- PASS: TestTeamNotificationConfigurationDelete/with_a_valid_ID (0.30s)
    --- PASS: TestTeamNotificationConfigurationDelete/when_the_notification_configuration_does_not_exist (0.13s)
    --- PASS: TestTeamNotificationConfigurationDelete/when_the_notification_configuration_ID_is_invalid (0.00s)
=== RUN   TestTeamNotificationConfigurationVerify
=== RUN   TestTeamNotificationConfigurationVerify/with_a_valid_ID
=== RUN   TestTeamNotificationConfigurationVerify/when_the_notification_configuration_does_not_exists
=== RUN   TestTeamNotificationConfigurationVerify/when_the_notification_configuration_ID_is_invalid
--- PASS: TestTeamNotificationConfigurationVerify (2.33s)
    --- PASS: TestTeamNotificationConfigurationVerify/with_a_valid_ID (0.39s)
    --- PASS: TestTeamNotificationConfigurationVerify/when_the_notification_configuration_does_not_exists (0.12s)
    --- PASS: TestTeamNotificationConfigurationVerify/when_the_notification_configuration_ID_is_invalid (0.00s)
=== CONT  TestTeamNotificationConfigurationsCreate_byType
=== RUN   TestTeamNotificationConfigurationsCreate_byType/with_trigger_change_request:created_and_all_required_values
=== PAUSE TestTeamNotificationConfigurationsCreate_byType/with_trigger_change_request:created_and_all_required_values
=== CONT  TestTeamNotificationConfigurationsCreate_byType/with_trigger_change_request:created_and_all_required_values
--- PASS: TestTeamNotificationConfigurationsCreate_byType (1.74s)
    --- PASS: TestTeamNotificationConfigurationsCreate_byType/with_trigger_change_request:created_and_all_required_values (0.14s)
PASS
ok  	github.com/hashicorp/go-tfe	20.447s

[jfreda]

A fix for the linting error might be kind of weird IMO, but I can do it if any reviewers feel strongly about it (I saw in CONTRIBUTING.md that linting is not strictly required for these to pass; not sure if this would require an ignore to not be noisy in CI).