Improve workday test coverage

[bdraco]

Proposed change

I had started by adding more tests to than fix the breakage reported in #119253, but this was already fixed in #119148 so I couldn't get the tests to fail. As soon as I revert to 2024.6.0, the tests fail spectacularly so we know the issue is fixed in dev.

I'm going to move forward the additional coverage to make sure it doesn't break again in the future.

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:
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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.

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

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

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  Updated and included derived files by running: python3 -m script.hassfest.
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• Untested files have been added to .coveragerc.

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[home-assistant]

Hey there @fabaff, @gjohansson-ST, mind taking a look at this pull request as it has been labeled with an integration (workday) you are listed as a code owner for? Thanks!

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[bdraco]

I think this is the problem, but the test passes before the change as well, so maybe not

[bdraco]

This doesn't seem to be the problem because we ignore the result from the callback