Allow underscore aliases for spawned agent IDs #6311

Job	Run time
build-and-check	3m 8s
test-integration-packages/internal	1m 11s
test-integration-packages/billing	1m 9s
test-integration-packages/agent-runtime	51s
test-integration-sdk	1m 22s
test-integration-cli	43s
test-cli	1m 1s
test-integration-web	43s
test-integration-common	50s
test-packages/internal	57s
test-packages/agent-runtime	58s
test-sdk	42s
test-common	49s
test-.agents	49s
test-web	1m 6s
test-packages/billing	48s
	17m 7s

Provide feedback