fix(normalize-color): require full-string match for rgb/hsl/hwb - #58496

Summary

@react-native/normalize-colors anchors hex color forms with ^/$, but rgb/rgba/hsl/hsla/hwb matchers did not. Because RegExp.prototype.exec finds a substring match, strings like xxrgb(1, 2, 3)yy or rgba(1,2,3,0.5)extra were accepted and normalized.

That is inconsistent with hex handling (#fff / #fff already return null) and with treating the whole input as a single color token.

Fixes #58495

Changelog

[GENERAL] [FIXED] - Reject functional color strings that only partially match rgb/hsl/hwb

Test Plan

yarn test packages/normalize-color/__tests__/normalizeColor-test.js

All 14 tests pass. Added cases for leading/trailing junk around rgb/rgba/hsl/hwb.

Minimal repro (before fix):

const normalizeColor = require('@react-native/normalize-colors');
normalizeColor('xxrgb(1, 2, 3)yy'); // was 0x010203ff, now null

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