inject fetch into backend #3938

Job	Run time
build-and-check	2m 31s
test-integration-backend	38s
test-integration-.agents	30s
test-.agents	36s
test-integration-common	36s
test-integration-cli	28s
test-cli	39s
test-integration-web	34s
test-npm-app	32s
test-integration-packages/agent-runtime	37s
test-integration-npm-app	30s
test-backend	2m 11s
test-web	37s
test-common	36s
test-packages/agent-runtime	32s
	12m 7s

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