[Feature]: package manager switch

Describe the feature that you would like added

ATM we use yarn midgard (msft fork of yarn v1 ) - it seems it doesn't have much traction from both feature additions/supporting the package.

"outside of fluent" family of packages maintained by core team uses yarn v3. It would be nice to unify on what package manager is used across our scope of projects.

"on paper" yarn 3 / pnpm should be faster and provide more richer feature set for our needs.

Features we are looking for:

• fastest possible installs
  • cold cache
  • switching branches
• proper dependency deduplication
• lowest disk size usage
• ability to patch installed packages
• workspaces support
• stricter dependency enforcement to avoid ghost dependencies and potential bugs/security issues
• compatibility with single version policy approach

Have you discussed this feature with our team

v-build

Additional context

No response

Validations

• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Priority

None

The issue names no files, tests, or entry points. Begin by comparing the current Yarn Midgard setup with Yarn 3 and pnpm against the listed requirements; done requires an agreed package manager and a migration plan.