Auto merge of #16156 - ferjm:issue-16130-http-network-or-cache-fetch, r=jdm
Auto merge of #16156 - ferjm:issue-16130-http-network-or-cache-fetch, r=jdm

Update http_network_or_cache_fetch according to spec

There are still many steps blocked by the absence of an HTTP cache and the inability to trigger a credentials dialog.

- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #16130

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