[miniflare] Rename Flags type to Flagship

[roerohan]

Rename the Flags type import to Flagship to match the upstream rename in @cloudflare/workers-types (cloudflare/workerd#6584).

• Import: Flags -> Flagship from @cloudflare/workers-types/experimental
• Return type of getFlagshipBinding: Promise<Flags> -> Promise<Flagship>

Fixes #13557

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: Type-only rename, no runtime behavior change.
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: Internal type rename, no user-facing API change.

A picture of a cute animal (not mandatory, but encouraged)

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[changeset-bot]

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Latest commit: ddb6d93

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[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• packages/miniflare/src/index.ts: [@cloudflare/wrangler]

[devin-ai-integration]

✅ Devin Review: No Issues Found

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

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commit: ddb6d93