Address sorting edge case.

There are times when the enqueue time of two different jobs are exactly
the same. In those cases, if an EJ skipped over one regular job with an
enqueue time X, then it should skip all other regular jobs with enqueue
time X.

Bug: 194324016
Test: atest FrameworksMockingServicesTests:JobSchedulerServiceTest
Test: atest CtsJobSchedulerTestCases
Change-Id: I77e106676238dd3ae198fab619af430e48d433a2