HYGIENE: Using assertIsInstance, assertIs, assertIsNone, assertIsNotNone when relevant #2364
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Inspired by:
https://github.com/GoogleCloudPlatform/google-cloud-python/pull/2348/files#r79664980
Note that virtually all of these commits were created by REGEX matching / replacing scripts, so it's worth just reviewing those scripts:
I ran the unit and system tests locally to make sure they all still pass.