Fix PHP highlighting for comment-like strings

[rajaditya28]

Fixes #204065

This updates the PHP grammar so quoted strings that begin with /* are not treated as quoted regular expressions. The regex-specific quoted-string rules now skip comment-like starts while preserving highlighting for valid quoted regex patterns.

A colorization fixture was added for the reported case, including single-quoted and double-quoted regex patterns to cover the existing behavior.

Validation:

• npm run test-extension -- -l vscode-colorize-tests --grep issue-204065

[rajaditya28]

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[Copilot]

Pull request overview

This PR fixes PHP TextMate highlighting so strings beginning with /* are treated as normal strings rather than quoted regex patterns, while preserving highlighting for valid slash-delimited regex strings.

Changes:

• Adds a negative lookahead to PHP single- and double-quoted regex grammar rules to skip /*.
• Updates the PHP grammar updater script so regenerated grammar preserves the patch.
• Adds a colorization fixture and expected results for the reported issue and regex regression coverage.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
extensions/php/syntaxes/php.tmLanguage.json	Updates regex quoted-string begin patterns to avoid comment-like starts.
extensions/php/build/update-grammar.mjs	Applies the same regex grammar patch during grammar regeneration.
extensions/vscode-colorize-tests/test/colorize-fixtures/issue-204065.php	Adds PHP fixture covering comment-like strings and valid regex strings.
extensions/vscode-colorize-tests/test/colorize-results/issue-204065_php.json	Adds expected TextMate colorization output for the fixture.
extensions/vscode-colorize-tests/test/colorize-tree-sitter-results/issue-204065_php.json	Adds empty tree-sitter expected output for the PHP fixture.