chore: Move to yarn 4 and workspaces #10321

Bugbot Review

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Final Result: Bugbot completed review and found 1 potential issue.

Request ID: serverGenReqId_e2199cf5-1e93-4087-9aeb-2acbe04eb6c4

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 258145b. Configure here.}