Limit schedule() calls for only persisted jobs.

Calling schedule() for persisted jobs is more expensive than for
non-persisted jobs, so set quotas only for persisted schedule() calls.
Also reducing the limit to 250 based on more analysis.

Bug: 135764360
Bug: 144363383
Test: atest CtsJobSchedulerTestCases
Change-Id: I4405a8da6245b9c9b32aa917b85cb351578205f5