fix(ci): make npm scripts Windows-safe

[dkattan]

No description provided.

[Copilot]

Pull request overview

This PR makes npm scripts Windows-compatible by replacing inline shell commands with cross-platform alternatives using the cross-env package. It also includes test stability improvements for CI environments.

Changes:

• Added cross-env package to enable cross-platform environment variable setting in npm scripts
• Extracted inline cleanup logic to a dedicated CJS script for Windows compatibility
• Increased test timeouts and added error handling for diagnostic tests that may be flaky under load

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
package.json	Updated npm scripts to use cross-env for setting NODE_OPTIONS; added cross-env to devDependencies
package-lock.json	Added cross-env package; downgraded @playwright/test version; marked vscode-test-playwright as extraneous
scripts/clean-vscode-test-user-data.cjs	New cross-platform script to clean VS Code test user data directory before running tests
src/test/debugUtils.test.ts	Increased test timeouts; added timeoutSeconds parameter; added error handling for diagnostic test

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