[joy-ui] Change the color scheme type to SupportedColorScheme

[Nikhilh26]

• I have followed (at least) the PR section of the contributing guide.

Closes #40664

[mui-bot]

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[Nikhilh26]

I dont understand why its failing

[danilo-leal]

Heya @Nikhilh26, thanks for opening your first issue here (and for your interest in Joy UI!). I'll leave @siriwatknp do the actual code review, but just wanted to pass along and drop a couple of tips about PR formating given you mentioned the tests failing:

• Always write the title in imperative form — i.e., "Add", "Change", "Make", etc.
• Add the product you're affecting in brackets — [joy-ui], [material-ui], etc.
• If you're opening a PR in light of an issue, use key words such as "Closes" and "Fixes" before the issue URL. GitHub then links them automatically, and once the PR is merged, the issue will be also closed.
• Make sure you add labels before opening the PR — that's why the tests were failing.

[Nikhilh26]

What are labels 😅

[danilo-leal]

You can add them either before or after opening PRs 👍

[Nikhilh26]

Thank you so much!

[sai6855]

Make sure you add labels before opening the PR — that's why the tests were failing.
@danilo-leal i don't think contributors can add/remove labels, it's only restricted to maintainers