[w3c/ServiceWorker] Isolate fix for race-network-and-fetch-handler stall from PR #1764 (PR #1777)

This pull request addresses a critical issue in the `race-network-and-fetch-handler` algorithm where the process would hang indefinitely.

**Problem:**
If both the network fetch and the corresponding fetch handler failed, the algorithm would not enqueue any response. This led to a deadlock, as the algorithm would continue waiting for a response to be added to the queue.

**Background:**
This issue was already addressed by @monica-ch within the scope of pull request #1764. Since that PR has seen no recent progress, I have created this new PR by isolating only the necessary changes to fix the stall.

**Purpose:**
The immediate goal of this PR is to unblock progress on the ServiceWorkerAutoPreload specification ([WICG/service-worker-auto-preload](https://www.google.com/search?q=https://github.com/WICG/service-worker-auto-preload)), which utilizes the corrected algorithm.


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

  https://github.com/w3c/ServiceWorker/pull/1777

-- Commit Summary --

  * add race-network-and-cache
  * update failure cases
  * Follow spec format
  * use |raceResponse| when empty
  * Remove race-network-and-cache source enum etc.
  * Remove unnecessary change to the enum

-- File Changes --

    M docs/index.bs (12)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1777.patch
https://github.com/w3c/ServiceWorker/pull/1777.diff

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