Validate config safeguard.

Set the value of runtime_min_ej_guarantee_ms lower than the allowed
value to ensure the safeguard activates and guarantees a minimum time
limit of 1 minute for EJs.

Bug: 141645789
Test: atest CtsJobSchedulerTestCases:JobThrottlingTest
Change-Id: Ifc6e4abdbd02ca96722f22db6a1dbccf1115a812