Re-enable reverse path validation tests in quic_connection_test.
Re-enable reverse path validation tests in quic_connection_test.

These tests were accidentally disabled while adding copt RVCM because they early returned before setting the copt.

PiperOrigin-RevId: 366226371
Change-Id: Ie0899dd0bdcb8c742f62db5a67f209cda19930a3

google/quiche,google/quiche,google/quiche,google/quiche