Add TURN_OFF/TURN_ON feature flags for fan

[gjohansson-ST]

Proposed change

Add feature flags TURN_OFF/TURN_ON for FanEntity.

It's a "copy/paste" implementation similar to ClimateEntity

Integations should set _enable_turn_on_off_backwards_compatibility to False to identify as migrated.
If integrations sets the new feature flags directly from start it will not log for above.

If integrations implements the turn_on/turn_off methods but doesn't set the new feature flags or doesn't set _enable_turn_on_off_backwards_compatibility to False it will automatically add the new feature flags and log a warning.

Todo

• Review core integrations that needs to be migrated
• Add new feature flags to frontend Add turn_on/off to FanEntity frontend#21339
• Adjust dev docs and add dev blog Add new FanEntityFeature flags TURN_ON/OFF developers.home-assistant#2243
• Fix tests

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.
  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.

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

[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (fan) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of fan can trigger bot actions by commenting:

• @home-assistant close Closes the pull request.
• @home-assistant rename Awesome new title Renames the pull request.
• @home-assistant reopen Reopen the pull request.
• @home-assistant unassign fan Removes the current integration label and assignees on the pull request, add the integration domain after the command.
• @home-assistant add-label needs-more-information Add a label (needs-more-information, problem in dependency, problem in custom component) to the pull request.
• @home-assistant remove-label needs-more-information Remove a label (needs-more-information, problem in dependency, problem in custom component) on the pull request.

[gjohansson-ST]

Remaining test failure conversation timeout is not related to this PR

[janiversen]

LGTM, thanks

[frenck]

Oh hi there @gjohansson-ST 👋

A wild merge conflict showed up! Could you take a look?

../Frenck

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

Learn more about our pull request process.

[frenck]

Thanks, @gjohansson-ST 👍

../Frenck