ProfileServiceTest refactor

Update mocking of the isStartedProfile logic to rely on a thread safe
map of started profiles to eliminate flake caused by threading.

Bug: 187061577
Test: atest BluetoothInstrumentationTests
Tag: #stability
Change-Id: I3b10771c0a49229108629c1886ff807dae580a36
Merged-In: I3b10771c0a49229108629c1886ff807dae580a36