fix: allow assets in multiworker setup

[emily-shen]

#7251 will allow running multiple workers in one Miniflare instance. Currently we only set up the router/asset worker for the first worker passed to miniflare, assuming this will be the only user worker. This PR will make sure assets works regardless of how many 'user workers' are passed in and at what point.

---

• Tests
  • TODO (before merge): once Support multiple workers in a single Miniflare instance #7251 is in.
  • Tests included
  • Tests not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: I don't think there are any existing docs covering this.

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---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20241106.0
workerd	1.20241106.1	1.20241106.1
workerd --version	1.20241106.1	2024-11-06

Please ensure constraints are pinned, and miniflare/workerd minor versions match.