[w3c/ServiceWorker] Editorial: queue a task in Cache API (PR #1837)

Updates to:
- [cache-match](https://w3c.github.io/ServiceWorker/#dom-cache-match) — wrap each resolve/reject path in a `Queue a task` on the promise's responsible event loop.
- [cache-matchall](https://w3c.github.io/ServiceWorker/#dom-cache-matchall) — wrap the CORS-check `TypeError` rejection in a `Queue a task` with an abort step.

Both methods resolved/rejected the promise directly from an "in parallel" block, which violates the "don't touch JS objects from parallel" rule.

This is part 5/6 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/1837

-- Commit Summary --

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

-- File Changes --

    M index.bs (13)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1837.patch
https://github.com/w3c/ServiceWorker/pull/1837.diff

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