Fix configuration path regex escaping

[Sean McManus (sean-mcmanus)]

Summary

• Replace sequential configuration-path escaping with a single-pass helper while preserving literal matching against paths as written in JSON.
• Add focused unit coverage for quotes, repeated backslashes, and regular-expression metacharacters.
• Address the js/double-escaping and js/incomplete-sanitization CodeQL findings together.

Validation

• TypeScript project build
• Targeted ESLint validation
• Extension unit tests (203 passing)

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[Copilot]

Pull request overview

This PR refactors how configuration paths are escaped for use in regex-based matching within configuration squiggle handling, aiming to preserve literal matching against the path spelling in the JSON text while reducing the risk of incorrect/double escaping.

Changes:

• Introduces a single-pass helper escapePathForSquiggles to escape configuration paths for literal regex matching.
• Switches CppProperties squiggle path matching in configurations.ts to use the new helper.
• Adds unit tests covering quotes, repeated backslashes, and regex metacharacters.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
Extension/test/unit/escape.test.ts	Adds focused unit coverage for path escaping behavior (quotes, backslashes, regex metacharacters).
Extension/src/Utility/Text/escape.ts	Adds escapePathForSquiggles helper implementing the single-pass escaping logic.
Extension/src/LanguageServer/configurations.ts	Replaces inline sequential escaping with the shared helper for squiggle path regex construction.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.