AccessibilityManagerServiceTest is setup to run on single user 0. Ignore

the tests that are failed due to the assumption failed.

**Root cause**: It seems Android Auto is running on multi-user mode,
hence the tests failed.

Bug: 330830233
Test: atest AccessibilityManagerServiceTest on Android Auto and Android phone
Flag: TEST_ONLY
Change-Id: Iaac8c6a9a720670af15b8be0c6dafe15ef80a1a8