refactor(ext/fetch): do not share error instance #27941
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The issue like #27715 is harder to debug because of the shared error instance which is created at the top-level of the file (and therefore it doesn't show any stacktrace when thrown).
This change it to create each instance of AbortError in each code path.
(Question: Is this in this way because of the perf concern?)
Maybe related to #23559