[w3c/permissions] PermissionStatus update steps touch DOM objects in parallel (Issue #421)

The [spec says](https://w3c.github.io/permissions/#dfn-permissionstatus-update-steps):

<img width="767" alt="image" src="https://github.com/w3c/permissions/assets/3136226/45436440-055b-4f9d-9b12-8bb8d5b9fe21">

Some questions:
1. What does _"it asynchronously runs"_ mean compared to _"it runs"_?
1. What object does _"this"_ refer to here? I suspect we mean _"status"_?
1. (As an optimization?) It seems to reference [associated Document](https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-document-window) and make a determination about [fully active](https://html.spec.whatwg.org/multipage/document-sequences.html#fully-active) on a background thread. Isn't that racy (e.g. with navigation)?

By the time the queued task runs, the document may no longer be "fully active", and we fire the event on a non-fully active document, which seems wrong.

It would seem more correct to move these checks into the queued task.

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