Close tethering when UI entitlement fails

This is a alternative way for moving TetherService logic
into EntitlementManager[1]. Settings would close tethering
when silent entitlement check fail. To be consistent,
tethering should also be closed if UI entitlement check
fails.

[1] https://android-review.googlesource.com/c/platform/frameworks/base/+/928136

bug: 129330738
Test: -build, flash, boot,
      -atest EntitlementManagerTest
      -manual test with carrier SIM

Change-Id: Idfc35461b6359f3a624e78d49b6f73812db6d8ab