* fix: change informer resync period in TestFinalizerCleanup unit test
* refactor TestFinalizerCleanup to avoid flakiness by asserting job and pod informer state
* minor cleanups in TestFinalizerCleanup test in job_controller_test.go
another minor cleanup in TestFinalizerCleanup test in job_controller_test.go
* reduce poll time to 10ms in TestFinalizerCleanup in job_controller_test.go when waiting for podStore cache to get updated
* remove a whitespace from TestFinalizerCleanup to keep diff smaller