Increase test coverage for google calendar (#62648)
* Increase test coverage for google calendar
Update tests to exercise the API responses, getting test coverage
to 97% for calendar.py
----------- coverage: platform linux, python 3.9.6-final-0 -----------
Name Stmts Miss Cover Missing
---------------------------------------------------------------------------
homeassistant/components/google/__init__.py 193 84 56% 92, 163-228, 238, 244-247, 254-262, 274, 298-299, 305-347, 387-392, 416-430, 435-437
homeassistant/components/google/calendar.py 122 4 97% 41, 45, 51, 135
---------------------------------------------------------------------------
TOTAL 315 88 72%
* Revert conftest changes
* Update typing errors found on CI
* Update python3.8 typing imports
* Remove commented out code
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