Stacked on #3115: keep its windows-* setup-pnpm-js-<run_id>-<run_attempt>-<job>
destination, and extend the same isolation to non-Windows jobs in ci.yml
and ci-master.yml with setup-pnpm-<run_id>-<run_attempt>. This prevents
sequential self-hosted Windows jobs from tripping over a stale locked
pnpm.exe/reflink native module.