Modify wakelock tag.

1. Remove the job ID from the wakelock tag.
2. Lazily load the tag when needed to reduce memory usage of jobs
   waiting for constraints to be satisfied.
3. Remove redundant log line.

Bug: 273758274
Bug: 302348192
Bug: 307556230
Test: atest CtsJobSchedulerTestCases
Test: Manually remove output of `adb shell dumpsys jobscheduler`
Change-Id: If8547d23ced90b17225ab8efd758ac735655687e