Make Sentry telemetry buffer configurable.

Via `sentry-telemetry-buffer` feature.

I think this causes high CPU use on Grebedoc.

src/observe.go

@@ -113,6 +113,7 @@ func InitObservability() {
 		}
 
 		options := sentry.ClientOptions{}
+		options.DisableTelemetryBuffer = !config.Feature("sentry-telemetry-buffer")
 		options.Environment = environment
 		options.EnableLogs = enableLogs
 		options.EnableTracing = enableTracing