Fix manual.alarm_control_panel RestoreEntity bugs

[bonzini]

Proposed change

The RestoreEntity implementation for the manual alarm control panel does not correctly restore timers. After this pull request, it restores the full state of the integration instead.

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.

[kbickar]

Why did you rename all the functions to async_? There aren't actually any async calls in any of them

[bonzini]

Why did you rename all the functions to async_

Because they must be called from the event loop and therefore can/must call the async_ version of the functions. I followed what seemed to be the convention with async_track_point_in_time and async_render: they are not async themselves but are called async_.

[jbouwh]

It helps if you split the refactor to a separate PR.

[bonzini]

Will do.

[frenck]

Instead of renaming the title of the PR to prefix "Draft: ", please just put the PR in actual draft.

[bonzini]

Sorry, got confused by GitHub/Gitlab differences. This is now draft until the dependency #83436 is ready and committed.

[jbouwh]

Tested with manual alarm control panel. If it is armed and HA is restarted it return in never ending pending state.
UPDATE: After some repeated tests I could not reproduce it, so may be it is nothing afterall.

[jbouwh]

Looks good to me,
Thnx @bonzini!

[balloob]

Removed this from the milestone because it builds on top of the async conversion.