Create new SubProject to not depend on Dataflow in Kafka

[fozzie15]

These changes will add a new sub-project for kafka tests which depend on Dataflow. This will allow us to test changes on Dataflow without creating a circular dependency between Dataflow and Kafka. This test is required for the Managed Schema Transform Providers which have functionality when executed on Dataflow.

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[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[Abacn]

We can remove push trigger. It's not quite useful in practice

[Abacn]

Set to sdks/java/io/kafka/gmk-tests for now so it won't report failures on unrelated PR

[derrickaw]

waiting on author

[ahmedabu98]

hey @fozzie15, is this PR still relevant?

[stankiewicz]

is this PR still relevant?

[github-actions]

This pull request has been marked as stale due to 60 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@beam.apache.org list. Thank you for your contributions.

[github-actions]

This pull request has been closed due to lack of activity. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.