Failure: beam_PostRelease_Python_Candidate timeout

The job requires more time to run all set of validations (quickstart + mobile game batch) on DataflowRunner/DirectRunner using/without using wheels in multiple Python version (2.7, 3.5, 3.6, 3.7)

Running all validations on Py2.7 environment tooks about 1h10mins. So we probably want to extend it to 5/6 hours.