chore: remove rimraf

[43081j]

Part of #11854.

Summary of changes:

• jest-image-snapshot dropped rimraf in 6.5.x. Updating means we can
  stop pulling it in across the board
• miniflare now uses premove
• pages-shared didn't use rimraf, so it has been removed
• workers-shared didn't use rimraf, so it has been removed
• workflows-shared now uses premove

This means rimraf is totally gone:

> pnpm why -r rimraf
(blank)

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: Infra change only
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: Infra change only

[changeset-bot]

⚠️ No Changeset found

Latest commit: 55e9365

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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commit: 55e9365