move run-agent-step to agent-runtime #3966

Job	Run time
build-and-check	2m 39s
test-integration-.agents	36s
test-integration-npm-app	28s
test-integration-common	36s
test-integration-backend	33s
test-.agents	36s
test-cli	30s
test-common	1m 21s
test-integration-web	32s
test-integration-cli	36s
test-integration-packages/agent-runtime	35s
test-backend	34s
test-npm-app	33s
test-packages/agent-runtime	39s
test-web	30s
	11m 18s

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