Deprecate light constants

[epenet]

Breaking change

For developers only: ATTR_COLOR_TEMP, ATTR_KELVIN, ATTR_MIN_MIREDS and ATTR_MAX_MIREDS should no longer be imported from light platform.

See #79591

Proposed change

Follow-up to #79591

Needs:

• Migrate tasmota lights to use Kelvin #132798
• Migrate zha lights to use Kelvin #132816
• Migrate mqtt lights to use Kelvin #132828
• Migrate demo lights to use Kelvin #132837
• Migrate flux to use Kelvin over Mireds #132839
• Adjust lifx to use local _ATTR_COLOR_TEMP constant #132840
• Refactor light significant change to use kelvin attribute #132853
• Refactor light reproduce state to use kelvin attribute #132854

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: Blog post about Kelvin as the preferred color temperature unit developers.home-assistant#2495

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[home-assistant]

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

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[frenck]

Nice, @epenet 👍

../Frenck