[w3c/ServiceWorker] Editorial: queue a task in ServiceWorkerContainer.getRegistration (PR #1833)

Update to [navigator-service-worker-getRegistration](https://w3c.github.io/ServiceWorker/#dom-serviceworkercontainer-getregistration).

The step running in parallel resolved/rejected the promise directly, which violates the "don't touch JS objects from parallel" rule. Wrap it in a `Queue a task` on the responsible event loop.

This is part 1/6 of #1740. Split out from #1755 for focused review.


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1833

-- Commit Summary --

  * Editorial: queue a task to resolve promise in ServiceWorkerContainer.getRegistration

-- File Changes --

    M index.bs (7)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1833.patch
https://github.com/w3c/ServiceWorker/pull/1833.diff

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