Add POST workaround for clients which cannot PATCH #3728

Job	Run time
staticcheck	1m 19s
lint	13s
build	15s
cross-compilation (GOOS=darwin, GOARCH=amd64)	44s
cross-compilation (GOOS=darwin, GOARCH=arm64)	42s
tests (macos/go-1.22	39s
cross-compilation (GOOS=freebsd, GOARCH=amd64)	42s
tests (ubuntu/go-1.22	22s
cross-compilation (GOOS=freebsd, GOARCH=arm64)	37s
tests (windows/go-1.22	4m 15s
cross-compilation (GOOS=linux, GOARCH=amd64)	28s
tests (macos/go-1.23	1m 14s
cross-compilation (GOOS=linux, GOARCH=arm64)	37s
tests (ubuntu/go-1.23	1m 13s
cross-compilation (GOOS=windows, GOARCH=amd64)	44s
tests (windows/go-1.23	1m 40s
cross-compilation (GOOS=windows, GOARCH=arm64)	42s
cross-compilation (GOOS=darwin, GOARCH=amd64)	47s
cross-compilation (GOOS=darwin, GOARCH=arm64)	38s
cross-compilation (GOOS=freebsd, GOARCH=amd64)	39s
cross-compilation (GOOS=freebsd, GOARCH=arm64)	38s
cross-compilation (GOOS=linux, GOARCH=amd64)	33s
cross-compilation (GOOS=linux, GOARCH=arm64)	43s
cross-compilation (GOOS=windows, GOARCH=amd64)	39s
cross-compilation (GOOS=windows, GOARCH=arm64)	37s
test-python-example	18s
test-gsutil-example	22s
test-node-example	15s
test-go-example	42s
test-dotnet-example	13s
test-scala-example	38s
test-java-example	19s
test-cpp-example	2m 19s
test-curl-example	6s
test-curl-both-scheme-default-ports-example	6s
test-curl-both-scheme-non-default-ports-example	7s
unblock-pr	1s
	27m 6s

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