Fix: mark the r2 bulk command as hidden and experimental

[dario-piotrowicz]

This PR is marking the r2 bulk command (introduced in #11285) as experimental and hiding it.

---

• Tests
  • Tests included
  • Tests not necessary because: we
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: this wasn't docu
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: the command is not in v3

[changeset-bot]

🦋 Changeset detected

Latest commit: 2fe26d3

The changes in this PR will be included in the next version bump.

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commit: 2fe26d3

[vicb]

Thanks Dario!