chore(example): add example to test context propagation #6608

Job	Run time
Build docker image	5m 44s
config-e2e	1s
Agent unit tests	1m 9s
CLI unit tests	1m 3s
API Server unit tests	3m 12s
WebUI unit tests	1m 57s
Test examples (collector)	40s
CLI e2e tests (8, 0)	1m 19s
WebUI End-to-end tests (1)	2m 43s
CLI e2e tests (8, 1)	1m 21s
CLI smoke tests (local)	43s
WebUI End-to-end tests (2)	2m 45s
Test examples (tracetest-jaeger)	39s
CLI e2e tests (8, 2)	1m 25s
CLI smoke tests (docker)	41s
WebUI End-to-end tests (3)	2m 38s
Test examples (tracetest-opensearch)	7m 23s
CLI e2e tests (8, 3)	1m 22s
WebUI End-to-end tests (4)	2m 43s
Test examples (tracetest-tempo)	41s
CLI e2e tests (8, 4)	1m 49s
WebUI End-to-end tests (5)	2m 46s
Test examples (tracetest-provisioning-env)	45s
CLI e2e tests (8, 5)	2m 29s
Tracetesting API Server (InMemory)	3m 52s
WebUI End-to-end tests (6)	3m 31s
CLI e2e tests (8, 6)	1m 37s
WebUI End-to-end tests (7)	2m 36s
CLI e2e tests (8, 7)	3m 37s
WebUI End-to-end tests (8)	2m 39s
Tracetesting API Server (NATS)	3m 50s
	1h 9m 40s

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