Deflake HealthConnectThreadSchedulerTest

- Decrease the delay used in a test to reduce the test time
- Change the assertion to be isAtLeast instead of isGreaterThan to account for the possibility of the task starting exactly after the time period.
- Change the assertion to be isAtMost instead of isLessThan to account for the case when it take exactly that long to finish.

Bug: 415847542
Test: unit test
Change-Id: Ic7e6477e5744f7cee3dfb0b381bcbc6bc49ff95c
Flag: TEST_ONLY
1 file changed