Refactor light reproduce state to use kelvin attribute

[epenet]

Breaking change

I don't think there is any

Proposed change

SSIA, follow-up to #79591

Needs:

• Improve coverage in light reproduce state #132929

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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]

This is also used by scenes, what if a user has stored a scene without kelvin (as it didn't exists before)?

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[frenck]

Nice! Thanks, @epenet 👍

../Frenck