Deprecate i386, armhf and armv7 Supervisor architectures

[agners]

Proposed change

Deprecate i386, armhf and armv7 Supervisor architectures. According to analytics there are 20 armhf and 8 i386 installation at this point. There are still 2340 armv7 installations, but quite some likely can be upgraded to 64-bit variants. If users don't want to replace these systems, they still can continue to run, they'll just won't receive updates.

This implements the following architecture discussions:

• Drop support for the `i386` architecture architecture#1200
• Drop support for the `armhf` architecture architecture#1199
• Drop support for the `armv7` architecture architecture#1230

This PR implements a simple mechanism through the Supervisor's unsupported mechanism to inform these remaining users. Once merged, in a second step we can then remove all the references from the codebase.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to the supervisor)
• 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:
• Link to cli pull request:
• Link to client library 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 Ruff (ruff format supervisor tests)
• Tests have been added to verify that the new code works.

If API endpoints or add-on configuration are added/changed:

• Documentation added/updated for developers.home-assistant.io
• CLI updated (if necessary)
• Client library updated (if necessary)

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