refactor(core): only apply publish and codecov if they exist

[andreasgangso]

Minor non-breaking change that allows a fork to easily substitute the :core module with their own implementation.
Useful e.g. when contributors are waiting for PRs to be merged.

Otherwise projects using forks would need to make empty files in their own projects which is ugly.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[andreasgangso]

For reference if anyone needs to substitute core with their own fork.

settings.gradle

include ':app', ':rudder-sdk-android-core'
project(':rudder-sdk-android-core').projectDir = new File('../external_projects/rudder-sdk-android/core')

root build.gradle

configure([project(":rudder-sdk-android-core")]) {
    ext {
        VERSION_NAME = "1.8.1"
    }
}

allprojects {
    configurations.all {
        resolutionStrategy.dependencySubstitution.all { DependencySubstitution dependency ->
            if (dependency.requested instanceof ModuleComponentSelector && dependency.requested.group == 'com.rudderstack.android.sdk') {
                def targetProject = findProject(':rudder-sdk-android-core')
                if (targetProject != null) {
                    logger.info('Substituting rudder-sdk-android-core with local :rudder-sdk-android-core.')
                    dependency.useTarget targetProject
                    logger.info('Successfully substituted rudder-sdk-android-core with local :rudder-sdk-android-core.')
                } else {
                    logger.error('Couldnt find local project(:rudder-sdk-android-core).')
                }
            }
        }
    }
}