[v2] Use only version number for BuildInfo (#6260)

## Which problem is this PR solving?
We were passing the whole VersionInfo to OTEL's BuildInfo, which
resulted in the metrics being labeled with a very long string:
`service_version="git-commit=600d82c5815289ba13197ce80b742c0f4411df78,
git-version=v2.0.0, build-date=2024-11-26T15:15:15Z"`

## Description of the changes
Only pass the actual version. The metrics become much more readable:
`jaeger_query_responses_count{operation="get_services",service_instance_id="06f22e3e-3ad7-4067-8b0f-15d35b329712",service_name="jaeger",service_version="v2.0.0"}`

## How was this change tested?
`$ curl -s http://localhost:8888/metrics | grep -v '^#' | grep
'get_services'`

Signed-off-by: Yuri Shkuro <[email protected]>

cmd/jaeger/internal/command.go

@@ -30,7 +30,7 @@ func Command() *cobra.Command {
 	info := component.BuildInfo{
 		Command:     "jaeger",
 		Description: description,
-		Version:     version.Get().String(),
+		Version:     version.Get().GitVersion,
 	}
 
 	settings := otelcol.CollectorSettings{