Allow underscore aliases for spawned agent IDs (#568) #6312

Job	Run time
build-and-check	3m 2s
test-integration-packages/internal	1m 9s
test-integration-packages/billing	1m 9s
test-integration-web	43s
test-integration-sdk	1m 19s
test-integration-cli	44s
test-integration-common	47s
test-integration-packages/agent-runtime	40s
test-packages/agent-runtime	45s
test-packages/internal	1m 0s
test-common	44s
test-cli	57s
test-packages/billing	40s
test-.agents	44s
test-web	1m 4s
test-sdk	46s
	16m 13s

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