Fix pending queue job presence check.

There are rare situations in which two different JobStatus might return
0 using the Comparator (eg. when persisted jobs are loaded at boot). In
those cases, binary search may sometimes return the wrong index. Switch
to a linear scan to ensure correctness. Even with the switch to a linear
scan, the PendingJobQueue implementation is still more efficient than
the prior mechanism (used before the switch to PendingJobQueue).

Bug: 228334264
Test: atest FrameworksServicesTests:PendingJobQueueTest
Change-Id: I4a31cb1fd5e0a8997eddaed3ecb45a4309abfd59