fix(agent): return correct cors headers for ingestion endpoint (#3976) #6426

Job	Run time
Build docker image	5m 50s
CLI unit tests	4m 34s
config-e2e	1s
Agent unit tests	2m 50s
API Server unit tests	4m 24s
WebUI unit tests	1m 55s
CLI smoke tests (local)	44s
Test examples (collector)	40s
Tracetesting API Server (InMemory)	3m 53s
CLI smoke tests (docker)	55s
Test examples (tracetest-jaeger)	39s
WebUI End-to-end tests (1)	2m 39s
Test examples (tracetest-opensearch)	7m 19s
WebUI End-to-end tests (2)	2m 33s
Test examples (tracetest-tempo)	39s
Tracetesting API Server (NATS)	3m 48s
Test examples (tracetest-provisioning-env)	40s
CLI e2e tests (8, 0)	1m 18s
WebUI End-to-end tests (3)	3m 42s
WebUI End-to-end tests (4)	2m 42s
CLI e2e tests (8, 1)	1m 23s
WebUI End-to-end tests (5)	2m 38s
CLI e2e tests (8, 2)	1m 17s
WebUI End-to-end tests (6)	2m 39s
CLI e2e tests (8, 3)	1m 25s
WebUI End-to-end tests (7)	2m 43s
CLI e2e tests (8, 4)	1m 15s
WebUI End-to-end tests (8)	2m 44s
CLI e2e tests (8, 5)	2m 28s
CLI e2e tests (8, 6)	1m 43s
CLI e2e tests (8, 7)	3m 41s
	1h 15m 41s

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