fix: don't use ui endpoint for version checking #6460

Job	Run time
Build docker image	6m 19s
config-e2e	1s
Agent unit tests	1m 10s
CLI unit tests	36s
API Server unit tests	2m 51s
WebUI unit tests	2m 3s
Test examples (collector)	44s
CLI smoke tests (local)	49s
Test examples (tracetest-jaeger)	43s
CLI smoke tests (docker)	42s
CLI e2e tests (8, 0)	1m 27s
Test examples (tracetest-opensearch)	7m 25s
WebUI End-to-end tests (1)	3m 2s
Test examples (tracetest-tempo)	48s
CLI e2e tests (8, 1)	1m 24s
Tracetesting API Server (InMemory)	4m 3s
WebUI End-to-end tests (2)	3m 6s
Test examples (tracetest-provisioning-env)	42s
CLI e2e tests (8, 2)	1m 35s
WebUI End-to-end tests (3)	3m 2s
CLI e2e tests (8, 3)	1m 33s
WebUI End-to-end tests (4)	3m 1s
CLI e2e tests (8, 4)	1m 33s
CLI e2e tests (8, 5)	2m 36s
WebUI End-to-end tests (5)	3m 2s
Tracetesting API Server (NATS)	4m 0s
CLI e2e tests (8, 6)	1m 37s
WebUI End-to-end tests (6)	2m 59s
WebUI End-to-end tests (7)	3m 45s
CLI e2e tests (8, 7)	3m 50s
WebUI End-to-end tests (8)	3m 7s
	1h 13m 35s

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