[w3c/ServiceWorker] Redesign Service-Worker-Allowed header extraction (PR #1830)

This change updates the Service-Worker-Allowed header handling to use modern Fetch primitives. Specifically:
1. Replaced 'extracting header list values' with 'header list/get'.
2. Added an explicit 'isomorphic decode' step for the header value.
3. Moved the failure check to follow the URL parsing step.

Fixes #1360


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

  https://github.com/w3c/ServiceWorker/pull/1830

-- Commit Summary --

  * Redesign Service-Worker-Allowed header extraction

-- File Changes --

    M index.bs (7)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1830.patch
https://github.com/w3c/ServiceWorker/pull/1830.diff

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