Don't include available agents as spawnable agents for now #5255

Job	Run time
build-and-check	2m 37s
test-integration-packages/internal	47s
test-integration-.agents	1m 17s
test-common	41s
test-integration-common	42s
test-integration-packages/billing	43s
test-integration-packages/agent-runtime	48s
test-.agents	43s
test-cli	1m 10s
test-integration-cli	42s
test-integration-web	40s
test-web	44s
test-integration-sdk	54s
test-packages/billing	47s
test-packages/agent-runtime	2m 14s
test-sdk	53s
test-packages/internal	41s
	17m 3s

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