Check return and mqtt fixtures typing in tests

[epenet]

Proposed change

Check return type and mqtt fixtures typing in tests

Linked to #87527
cc @jbouwh

Example:

# pylint --disable=all --enable=hass-argument-type,hass-return-type --ignore-missing-annotations=n tests/components/axis/test_device.py
************* Module tests.components.axis.test_device
tests/components/axis/test_device.py:80:35: W7431: Argument hass should be of type ['HomeAssistant', 'HomeAssistant | None'] in test_device_support_mqtt (hass-argument-type)
tests/components/axis/test_device.py:80:0: W7432: Return type should be None in test_device_support_mqtt (hass-return-type)
tests/components/axis/test_device.py:80:41: W7431: Argument mqtt_mock should be of type MqttMockHAClient in test_device_support_mqtt (hass-argument-type)

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
• The code has been formatted using Black (black --fast 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.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[jbouwh]

Nice this will help a lot.
Looks good to me,
Thnx @epenet !