move buildSpawnableAgentsDescription to agent-runtime package #3944

Job	Run time
build-and-check	2m 36s
test-integration-backend	38s
test-integration-packages/agent-runtime	31s
test-integration-cli	35s
test-integration-web	37s
test-common	29s
test-integration-.agents	32s
test-cli	30s
test-integration-common	36s
test-.agents	32s
test-web	33s
test-npm-app	38s
test-integration-npm-app	36s
test-backend	39s
test-packages/agent-runtime	36s
	10m 38s

Provide feedback