Add logs to start and close for InputManagerGlobal.TestSession

Tests can be affected if a non-hermetic test starts a test session
but never closes it. In order to monitor this, add logs when a
test session is strted or closed.

Bug: 245989146
Test: atest CtsInputTestCases
Flag: EXEMPT logs_only
Change-Id: Idc33219964073b02c757b1a1b22700ddb76e56b3