fix: Chrome Extensions service worker host registration

[codebytere]

Description of Change

Closes #34178.

Fixes basic Chrome Extension Manifest V3 service worker functionality. Previously, the service worker would register but could not run any chrome APIs:

[61131:0731/100424.234951:ERROR:render_process_host_impl.cc(3967)] Request for unknown Channel-associated interface: extensions.mojom.ServiceWorkerHost

This fixes that and adds a simple regression test.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Fixed an issue where service workers could not run Chrome APIs in Chrome Extensions Manifest V3.

[release-clerk]

Release Notes Persisted

Fixed an issue where service workers could not run Chrome APIs in Chrome Extensions Manifest V3.

[trop]

I have automatically backported this PR to "26-x-y", please check out #39310

[trop]

I have automatically backported this PR to "24-x-y", please check out #39311

[trop]

I have automatically backported this PR to "25-x-y", please check out #39312

[dragonsinth]

This may be a dumb question, but I can't get background scripts to work at all. I found this PR looking for answers-- the fact that this sample exists suggests background scripts should work? But I can't even get this sample to work in 26.6.9. Is this like.. a brand new feature?

I copied this exact sample, loading it into electron-react-boilerplate:

app.whenReady().then(async () => {
  const ext: Electron.Extension = await session.defaultSession.loadExtension(
      '/Users/scottb/github/electron-react-boilerplate/electron-react-boilerplate/mv3-service-worker',
      {
        allowFileAccess: true,
      },
  );
  console.log(ext)
})

And get this output:

{
  id: 'ciapjocennpjgkpponngfceicijjbnlc',
  name: 'MV3 Service Worker',
  path: '/Users/scottb/github/electron-react-boilerplate/electron-react-boilerplate/mv3-service-worker',
  url: 'chrome-extension://ciapjocennpjgkpponngfceicijjbnlc/',
  version: '1.0',
  manifest: {
    background: { service_worker: 'background.js' },
    content_scripts: [ [Object] ],
    description: 'Test for extension service worker support.',
    manifest_version: 3,
    name: 'MV3 Service Worker',
    version: '1.0'
  }
}

[60264:0208/091005.172943:ERROR:extensions_browser_client.cc(69)] Extension Error:
  OTR:     false
  Level:   1
  Source:  manifest.json
  Message: Service worker registration failed. Status code: 2
  ID:      ciapjocennpjgkpponngfceicijjbnlc
  Type:    ManifestError