Ensure test async_create_task eager start behavior matches production

[bdraco]

Proposed change

async_create_task defaults to True in production, but there was one remaining place in the test helpers were it defaulted to False

• For cases where it was a simple such as a patch being set too late, I fixed the tests.

• For other cases where defaulting to True that caused the test to fail, I set it to False in the production code so they can analyzed and fixed in future PRs

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 #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
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• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

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[jbouwh]

LGTM,
Thnx @bdraco 👍

[bdraco]

thanks

[bdraco]

FAILED tests/components/modbus/test_light.py::test_light_service_turn[do_config0] - AssertionError: assert 'off' == 'unavailable' is a flakey test and unrelated to this PR

I'm going to rerun it just to be 100% sure though

[bdraco]

passed on second run