Automatic merge from submit-queue (batch tested with PRs 45990, 45544, 45745, 45742, 45678)

[Federation]  Add integration testing for cluster addition

This PR adds integration testing of the sync controller for cluster addition.  This ensures coverage equivalency between the integration tests and the old controller unit tests, so those tests are removed by this PR.

Resolves #45257

cc: @kubernetes/sig-federation-pr-reviews