Fix AccessibilityManagerTest turn off services flaky

UiAutomation close and re-open impact a11y service life cycle
then cause test flaky. Move InstrumentedAccessibilityService
into common libray, and use it to enable or disable a11y service.

Bug: 129330012
Test: atest AccessibilityManagerTest
Change-Id: Iec36e05f8e625dca2fec27f5750236c228c14ec2
24 files changed