Fix Rainbird unique to use a more reliable source (mac address)

[allenporter]

Proposed change

Update rainbird unique id selection to use the mac address rather than the serial number, which is sometimes zero. This would have been a better fix for #101168 to handle the zero serial number case in hindsight.

The config flow will now exclusively use the rainbird mac address, which seems to be broadly supported according to testing from the community in allenporter/pyrainbird#270 -- but just incase, we still keep the serial number around in the config entry. We still additionally dedup config entries on unique host/pass given the mix of prior types of unique ids.

Existing config entries that have no unique id (created using the logic in 2023.10.X that skips setting unique id for serial "0") are fixed in the setup to use the mac address. Existing unique ids that use the serial number are left alone.

This is not scheduled for a patch release, since it is a larger change than the previous unique id fixes.

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: Rainbird integration does not show entities #103461
• Link to documentation pull request:

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[home-assistant]

Hey there @konikvranik, mind taking a look at this pull request as it has been labeled with an integration (rainbird) you are listed as a code owner for? Thanks!

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[home-assistant]

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