[w3c/ServiceWorker] Editorial: queue a task in NavigationPreloadManager (PR #1834)

Update to [navigation-preload-manager-enable](https://w3c.github.io/ServiceWorker/#dom-navigationpreloadmanager-enable), [navigation-preload-manager-disable](https://w3c.github.io/ServiceWorker/#dom-navigationpreloadmanager-disable), [navigation-preload-manager-setheadervalue](https://w3c.github.io/ServiceWorker/#dom-navigationpreloadmanager-setheadervalue), and [navigation-preload-manager-getstate](https://w3c.github.io/ServiceWorker/#dom-navigationpreloadmanager-getstate).

All four methods resolved/rejected their promises directly from an "in parallel" block, which violates the "don't touch JS objects from parallel" rule. Wrap the promise-touching steps in a `Queue a task` on the responsible event loop.

This is part 2/6 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/1834

-- Commit Summary --

  * Editorial: queue a task to resolve/reject promise in NavigationPreloadManager

-- File Changes --

    M index.bs (23)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1834.patch
https://github.com/w3c/ServiceWorker/pull/1834.diff

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