perf: Remove redundant unstable_cache from /api/agents route #5417

Job	Run time
build-and-check	2m 45s
test-integration-packages/agent-runtime	38s
test-integration-common	42s
test-integration-cli	48s
test-integration-sdk	40s
test-integration-packages/internal	45s
test-integration-web	39s
test-packages/internal	52s
test-packages/agent-runtime	55s
test-packages/billing	39s
test-.agents	39s
test-integration-packages/billing	42s
test-common	44s
test-integration-.agents	43s
test-web	52s
test-sdk	45s
test-cli	1m 13s
	15m 1s

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