fix(agent): update error handling on shutdown #6504

Job	Run time
config-e2e	1s
Build docker image	5m 38s
Agent unit tests	1m 12s
CLI unit tests	29s
API Server unit tests	2m 37s
WebUI unit tests	2m 0s
Test examples (collector)	39s
CLI smoke tests (local)	41s
CLI e2e tests (8, 0)	1m 38s
Test examples (tracetest-jaeger)	43s
CLI smoke tests (docker)	45s
WebUI End-to-end tests (1)	2m 28s
CLI e2e tests (8, 1)	1m 51s
Test examples (tracetest-opensearch)	7m 26s
WebUI End-to-end tests (2)	2m 32s
CLI e2e tests (8, 2)	1m 30s
Test examples (tracetest-tempo)	44s
WebUI End-to-end tests (3)	2m 34s
CLI e2e tests (8, 3)	1m 21s
Test examples (tracetest-provisioning-env)	39s
WebUI End-to-end tests (4)	2m 27s
Tracetesting API Server (InMemory)	3m 54s
CLI e2e tests (8, 4)	1m 39s
WebUI End-to-end tests (5)	3m 40s
CLI e2e tests (8, 5)	2m 47s
WebUI End-to-end tests (6)	2m 31s
CLI e2e tests (8, 6)	1m 39s
WebUI End-to-end tests (7)	2m 34s
Tracetesting API Server (NATS)	3m 55s
CLI e2e tests (8, 7)	3m 46s
WebUI End-to-end tests (8)	2m 30s
	1h 8m 50s

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