Bug 1832981 [wpt PR 40001] - Serialize color-mix with legacy color as…

… color(srgb ... ), a=testonly

Automatic update from web-platform-tests
Serialize color-mix with legacy color as color(srgb ... )

w3c/csswg-drafts#8444 (comment)
In order to avoid painful and unexpected gamut mapping, color-mix
and relative color with all legacy color formats (rgb, rgba, hsl, hwb)
will return results in the color(srgb ... ) format, unbounded.

This mostly means resetting test expectations.
gamut-mapping.html has been renamed as color-mix-out-of-gamut.html to
reflect the fact that there is no longer any expectation of "mapping."

The test changes are proposed to be a part of interop 2023
web-platform-tests/interop#333

Bug: 1427304
Change-Id: I546619c58b8603acb2879e787c421ab339da3288
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4528835
Reviewed-by: Yi Xu <yiyixchromium.org>
Commit-Queue: Aaron Krajeski <aaronhkchromium.org>
Cr-Commit-Position: refs/heads/main{#1145537}

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wpt-commits: 7b226a12f55910b4ae6ce873d15de1723d042720
wpt-pr: 40001

UltraBlame original commit: 51a2d6b1e6a1350727da5e2692b040ca9906db1b