refactor: move @cloudflare/workers-shared as dev dependency

[bluwy]

What this PR solves / how to test

Fixes N/A

It looks like @cloudflare/workers-shared is being bundled so it can be moved as a dev dependency instead. It was moved as a dependency in #6432, but after the refactors from #6564, it should be safe to move it back as a dev dependency again.

I also noticed that the published code for @cloudflare/workers-shared isn't quite right (?) as there's no entrypoint when importing @cloudflare/workers-shared directly. So externalizing it may not work.

Author has addressed the following

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because: refactor
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because: refactor
• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Changeset included
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• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal refactor

[changeset-bot]

🦋 Changeset detected

Latest commit: 80611b5

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Patch
@cloudflare/vitest-pool-workers	Patch

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