Convert test helpers to get hass instance to contextmanagers

[cdce8p]

Proposed change

Atm using either get_test_home_assistant or async_test_home_assistant has the side effect of setting the timezone. Thus the caller has to remember to reset it afterwards which is easy to forget / even missing in some cases. Thus currently the CI test only pass because the order of execution isn't changed and it happens to work out ok. The pytest v8.0 update will change that though and subsequently tests start to fail. #109876

This PR aims to provide a long term solution by changing the helper functions to contextmanagers which cleanup / reset the timezone themself so the caller doesn't have to anymore.

Note

This turned out to be a larger change mostly because the indentation needed to be updated in a lot of cases. It's probably best to look each commit individually. I spilt them in a way that each can be applied on its own, one after the other.

Type of change

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

Additional information

• This PR fixes or closes issue: fixes #
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Checklist

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• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

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  Updated and included derived files by running: python3 -m script.hassfest.
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[bdraco]

LGTM. Was much easier to check with white space turned off in the diff