fix: make EmitterFactory respect allow_remote_modules option when determining no npm mode

[nyannyacha]

What kind of change does this PR introduce?

Enhancement

Description

This PR improves EmitterFactory so that it can determine no npm mode via the allowRemoteModules passed in by the user. (The original option for this is no_npm, but this is not exposed in js land).

// main service
await EdgeRuntime.userWorkers.create({
      servicePath,
      memoryLimitMb,
      workerTimeoutMs,
      noModuleCache,

      allowRemoteModules: false,
      ...
});

// some user script
import * as jose from 'npm:jose'
...

Output

...
DEBUG Snapshot already up to date. Skipping pending resolution.
failed to load 'npm:jose': npm specifiers were requested; but --no-npm is specified
An error has occured
InvalidWorkerCreation: worker boot error failed to load 'npm:jose': npm specifiers were requested; but --no-npm is specified
    at async UserWorker.create (ext:sb_user_workers/user_workers.js:155:15)
    at async createWorker (file:///workspaces/edge-runtime/examples/main/index.ts:85:12)
    at async callWorker (file:///workspaces/edge-runtime/examples/main/index.ts:104:22)
    at async respond (ext:sb_core_main_js/js/http.js:162:14) {
  name: "InvalidWorkerCreation"
}

Fixes #340

[github-actions]

🎉 This PR is included in version 1.50.1 🎉

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