Add experimental secrets property to config validation

[jamesopstad]

Add experimental secrets property to config validation.

Not adding to the schema yet so it's hidden

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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: experimental feature

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[changeset-bot]

🦋 Changeset detected

Latest commit: de57ab3

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

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commit: de57ab3

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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[dario-piotrowicz]

Looks good to me 😄

I just left two minor questions, sorry if these were already discussed 🙇