Add getSupportedCompatibilityDate export

[dario-piotrowicz]

Fixes #[insert GH or internal issue link(s)].

Describe your change...

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• 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:

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[changeset-bot]

🦋 Changeset detected

Latest commit: 7cdc307

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

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[claude]

Claude finished @dario-piotrowicz's task —— View job

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Changeset Review

Tasks

• Read changeset guidelines from .changeset/README.md
• Read the changeset file .changeset/better-needles-begin.md
• Validate changeset against review criteria
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✅ All changesets look good

The changeset for .changeset/better-needles-begin.md passes all validation criteria:

1. ✅ Version Type: Correctly marked as minor for a new function export
2. ✅ Changelog Quality: Clear description with a helpful code example showing how to use the new function
3. ✅ Markdown Headers: No problematic h1/h2/h3 headers used
4. ✅ Analytics: Not applicable (no analytics changes)
5. ✅ Dependabot: Not applicable (not a dependency update)
6. ✅ Experimental features: Not applicable (this is a stable API export)

The changeset follows the guidelines well with a clear title, explanatory body text, and a practical TypeScript usage example.

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commit: 7cdc307

[dario-piotrowicz]

Closing in favor of #12387