[w3c/ServiceWorker] Clone response in Lookup Race Response algorithm (PR #1811)

The "Lookup Race Response" algorithm returned a response from the race response map directly. This could lead to issues where a response body is consumed more than once, as a Response object's body cannot be reused across multiple fetch operations.

This change modifies the algorithm to return a clone of the response, aligning with the Fetch specification's standard practice for handling responses that may be used by multiple consumers. This ensures that each fetch handler receives a distinct, readable stream.

See also: https://fetch.spec.whatwg.org/#concept-response-clone


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

  https://github.com/w3c/ServiceWorker/pull/1811

-- Commit Summary --

  * Clone response in Lookup Race Response algorithm

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1811.patch
https://github.com/w3c/ServiceWorker/pull/1811.diff

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