WC-4185 Support variable asset count based on claims from upstream

[matthewdavidrodgers]

As noted in the comments, normally we'd need to validate this jwt, but since any uploads depend on a valid jwt (and are validated later) it's fine to just decode the jwt and check for this feature

For WC-4185

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---

• Tests
  • [x] Tests included/updated
  • [ ] Tests not necessary because:
• Public documentation
  • [ ] Cloudflare docs PR(s):
  • [x] Documentation not necessary because: internal-only change
• Wrangler V3 Backport
  • [ ] Wrangler PR:
  • [x] Not necessary because: not a patch change

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: e77e818a40fa74f4c44d5af9b2a5762a243cab01

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commit: e77e818

[Mahmoodyazdanpanah]

✅️🫡

[Mahmoodyazdanpanah]

✅️🫡

[matthewdavidrodgers]

CI failures fixed by https://github.com/cloudflare/workers-sdk/pull/11564