Remove the concurrently as a dependency and update other outdated dependencies

[janechu]

Pull Request

📖 Description

This fixes the current npm vulnerabilities.

✅ Checklist

General

• I have included a change request file using $ npm run change
• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Agents

• I have linked to an existing issue in this project that this change addresses
• I have read the skills
• I have read the DESIGN.md file(s) in packages relevent to my changes
• I have updated the DESIGN.md file(s) in packages relevent to my changes

[Copilot]

Pull request overview

This PR removes the vulnerable concurrently dev dependency from the monorepo and replaces its limited usage in @microsoft/fast-element with a small in-repo Node script for running multiple npm scripts in parallel, while also updating the lockfile to pick up transitive dependency security fixes.

Changes:

• Added a run-npm-scripts.js helper to run multiple npm run <script> tasks concurrently and terminate the remaining tasks when one finishes or on shutdown signals.
• Updated @microsoft/fast-element npm scripts (dev:declarative, test:ui:declarative) to use the new helper instead of concurrently.
• Removed concurrently from root devDependencies and updated package-lock.json to reflect removals and transitive dependency updates.

Reviewed changes

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

Show a summary per file

File	Description
packages/fast-element/scripts/run-npm-scripts.js	New internal parallel runner to replace concurrently for selected dev workflows.
packages/fast-element/package.json	Swaps concurrently usage for the new script; adds a dedicated Playwright UI runner script target.
package.json	Removes concurrently from root dev dependencies.
package-lock.json	Lockfile refresh removing concurrently and updating related transitive dependencies.
change/@microsoft-fast-element-3909d052-d93c-4481-9ca6-4e8b0d0173b6.json	Change file documenting the dependency/security maintenance update.