Use asynctest-mock in most places

[balloob]

Breaking change

Proposed change

Migrate to always using the same patch function from tests.asynctest_mock. That way we will also teach new people writing tests to do it the right way.

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• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
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• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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[balloob]

This was done in a big swoop by updating all test files that did not use mock_coro. I ran tests locally and seems fine, if not too many tests fail I'll fix it up and we can merge it. If too many tests fail I'll bail 😅

[frenck]

Considering your comment... I would say this was a smooth sail ⛵️

👍