Add config tests for including provider config files #74

Job	Run time
address_ub_sanitizer	17m 48s
basic_clang	5m 24s
basic_gcc	4m 14s
check_docs	1m 26s
check_update	1m 30s
check-ansi	4m 8s
enable_non-default_options	4m 41s
fips_and_ktls	3m 49s
memory_sanitizer	18m 53s
minimal	1m 28s
no-deprecated	4m 13s
non-caching	19m 59s
no-shared (ubuntu-latest)	1s
no-shared (macos-latest)	1m 37s
threads_sanitizer	4m 18s
buildtest	4m 14s
enable_brotli_and_asan_ubsan	9m 2s
enable_brotli_and_zstd_dynamic	8m 47s
enable_brotli_dynamic	8m 48s
enable_zstd_and_asan_ubsan	13m 43s
enable_zstd_dynamic	9m 35s
enable-tfo (ubuntu-latest)	1s
external-test-cf-quiche	3m 54s
enable-tfo (macos-latest)	4m 35s
external-test-pyca (1.51.0, 3.9)	3m 12s
external-tests	3m 48s
legacy	1m 41s
no-legacy	5m 5s
out-of-source-and-install (ubuntu-latest)	1s
out-of-source-and-install (macos-latest)	4m 0s
	2h 53m 55s

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