move callMainPrompt to agent-runtime #4036

Job	Run time
build-and-check	2m 41s
test-cli	38s
test-.agents	37s
test-common	45s
test-web	38s
test-packages/agent-runtime	47s
test-integration-web	38s
test-backend	41s
test-integration-npm-app	44s
test-npm-app	51s
test-integration-cli	39s
test-integration-backend	42s
test-integration-.agents	38s
test-integration-packages/agent-runtime	45s
test-integration-common	41s
	12m 25s

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