Add CLI binary download proxy endpoint #3953

Job	Run time
build-and-check	2m 31s
test-integration-cli	31s
test-integration-npm-app	32s
test-integration-.agents	37s
test-integration-packages/agent-runtime	34s
test-integration-common	29s
test-integration-web	34s
test-.agents	29s
test-backend	38s
test-common	31s
test-cli	37s
test-npm-app	40s
test-packages/agent-runtime	33s
test-web	29s
test-integration-backend	33s
	10m 18s

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