[chore] Remove resolved TODO about span name prefix (#12333)

#### Description
This PR deletes the TODO comment that sparked #9382. The original intent
is a bit unclear, but it is probably addressed by #11769. See tracking
issue for discussion and related PRs.

#### Link to tracking issue
Resolves #9382

config/confighttp/confighttp.go

@@ -482,7 +482,6 @@ func (hss *ServerConfig) ToServer(_ context.Context, host component.Host, settin
 		serverOpts.OtelhttpOpts...)
 
 	// Enable OpenTelemetry observability plugin.
-	// TODO: Consider to use component ID string as prefix for all the operations.
 	handler = otelhttp.NewHandler(handler, "", otelOpts...)
 
 	// wrap the current handler in an interceptor that will add client.Info to the request's context