Remove Network, NetworkRequest metrics from jobscheduler

These metrics are deprecated so remove them from jobscheduler.
Also remove dumpDebug method from Network, NetworkRequest and
NetworkCapabilities because there's no caller anymore.

This change also for connectivity mainline module. These
three classes are inculded in framework-connectivity so
external module cannot have dependencies on its hidden API.
With this change, the dependencies can be removed.

Bug: 178777253
Test: FrameworksNetTests
      JobStoreTest
      adb shell dumpsys jobscheduler --proto
      CtsIncidentHostTestCases:JobSchedulerIncidentTest
Change-Id: Ie0c540303ba06b8fba029d2b98ae753afb08c963