Cleanup lockfile / dependencies (#20102)

This PR reduces the installed dependencies by cleaning up the
`pnpm-lock.yaml` file.

This also pins `@parcel/watcher` such that the lockfile is generated
properly becauase of the patched dependencies.

This is a follow-up of #19499, but up to date with the latest state of
the repo.

## Test plan

- Lockfile is simpler. Most dependencies stayed the same, and were
published _months_ ago. There are a few cases where we have more recent
published dependencies. There are 7 dependencies that were published in
the last ~24 hours: `node-releases@2.0.46` (10 hours ago),
`electron-to-chromium@1.5.361` (12 hours ago), `semver@7.8.1` (20 hours
ago), `terser@5.48.0` (20 hours ago), `webpack-sources@3.5.0` (5 hours
ago), `vite@8.0.14` (yesterday). All of these but the `terser` version
used OIDC.
- Socket.dev didn't report any issues with the changed dependencies
- All tests still pass

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Co-authored-by: James Garbutt <43081j@users.noreply.github.com>