Rename Monitor performance counters Otel property (#44310)

Author: ArcturusZhang

specification/monitor/resource-manager/Microsoft.Insights/Insights/client.tsp

@@ -627,6 +627,11 @@ namespace Microsoft.InsightsCombinedClient;
   "KnownPerformanceCountersOtelDataSourceStreams",
   "csharp"
 );
+@@clientName(
+  DataCollectionApi.DataSourcesSpec.performanceCountersOTel,
+  "PerformanceCountersOtel",
+  "csharp"
+);
 @@clientName(
   DataCollectionApi.DataFlow.captureOverflow,
   "ShouldCaptureOverflow",