Backend: Remove Deprecated Color.withAlpha

[j10a1n15]

What

Removes ~32 deprecation messages if I counted correctly
Also can this method just please stay removed ty

Changelog Technical Details

• Removed deprecated Color.withAlpha method in favor of Color.addAlpha. - j10a1n15

[github-actions]

I have detected some issues with your pull request:

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Author is not set in text: + Removed Deprecated Color.withAlpha method in favour Color.addAlpha
Change should end with a full stop in text: Removed Deprecated Color.withAlpha method in favour Color.addAlpha

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[github-actions]

I have detected some issues with your pull request:

Body issues:
Author is not set in text: + Removed Deprecated Color.withAlpha method in favour Color.addAlpha
Change should end with a full stop in text: Removed Deprecated Color.withAlpha method in favour Color.addAlpha

Please fix these issues. For the correct format, refer to the pull request template.

[hannibal002]

Also can this method just please stay removed ty

you talk about the removal of deprecated functions should not be reverted?
as long as the deprecation got added a long time ago its fine
removing too early breaks the logic behind using deprecation entirely, i could instead just remove the function in the first place.

but we dont want this, we already have enough merge conflicts in open prs.

[j10a1n15]

as long as the deprecation got added a long time ago its fine

it got removed ~1 month ago with #2112