fix!: immutable headers guards for incoming response and downstream request #4808

Job	Run time
check-changelog	9s
check-docusaurus	11m 11s
Ensure that all required "cargo install" commands are run, or we have a cache hit (viceroy, 0.12.0)	3s
shellcheck	4s
Ensure that all required "cargo install" commands are run, or we have a cache hit (wasm-tools, 1....	6s
format	16s
Debug Build	3m 9s
Build (release)	8m 10s
Build (weval)	5m 41s
Run Web Platform Tests Debug	4m 43s
sdktest-debug (viceroy)	1m 46s
sdktest-debug (compute)	5m 21s
Run Web Platform Tests (release)	1m 20s
Run Web Platform Tests (weval)	1m 19s
test-npm-package (18, ubuntu-latest)	29s
test-npm-package (22, ubuntu-latest)	28s
test-npm-package (22, windows-latest)	56s
test-npm-package (22, macos-latest)	28s
sdktest (compute, release)	2m 33s
sdktest (compute, weval)	2m 41s
sdktest (viceroy, release)	49s
sdktest (viceroy, weval)	1m 22s
	53m 4s

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