Remove RESTRICTED bucket off code.

The RESTRICTED bucket has been enabled for a few releases and we have no
intention of disabling it by itself at this point.

Bug: 273564840
Test: atest CtsJobSchedulerTestCases:ConnectivityConstraintTest
Test: atest CtsJobSchedulerTestCases:JobThrottlingTest
Test: atest CtsUsageStatsTestCases:UsageStatsTest
Change-Id: I51bfd0b00bb582a839a356e8d926a6d0ca81a683