Allow GitLab docs merge requests in PR validation

[tpmmorris]

The PR description validator currently only allows PRs to the GitHub cloudflare-docs repository. We should also allow MRs to the GitLab repository, as they are mirrored.

---

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

---

[changeset-bot]

⚠️ No Changeset found

Latest commit: 544bc01

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[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[ask-bonk]

LGTM

github run

[devin-ai-integration]

Devin Review found 1 potential issue.

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commit: 544bc01

[workers-devprod]

Codeowners reviews satisfied