Deprecate mailbox platform

[edenhaus]

Breaking change

Deprecate the mailbox integration platform and the asterisk integrations, as they only implement the mailbox platform.

We deprecate the mailbox integration because the mailbox platform is used only by the asterisk integrations, where asterix_cdr has 0 active installations and asterisk_mbox only 25. By removing the mailbox platform we can also remove the custom mailbox panel from the frontend.

Proposed change

We deprecate the mailbox integration because the mailbox platform is used only by the asterisk integrations, where asterix_cdr has 0 active installations and asterisk_mbox only 25. By removing the mailbox platform we can also remove the custom mailbox panel from the frontend.

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: Deprecate mailbox platform home-assistant.io#31632

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.

To help with the load of incoming pull requests:

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

[MartinHjelmare]

I think we should add some context in the PR description why we remove the mailbox integration.

[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.

[MartinHjelmare]

Thanks!

[edenhaus]

CI / Run tests Python 3.11 (7) (pull_request) :
FAILED tests/components/switcher_kis/test_init.py::test_update_fail - AssertionError: assert 'unavailable' != 'unavailable' is unrelated