Updating perf counter instance name matching

When creating perf counters with instances the input was not matching any existing instances as the category was reporting them in lower case.

src/Microsoft.Diagnostics.EventFlow.Inputs.PerformanceCounter/ProcessInstanceNameCache.cs

@@ -49,7 +49,7 @@ public string GetCounterInstanceNameForCurrentProcess(PerformanceCounterConfigur
                 PerformanceCounterCategory category = new PerformanceCounterCategory(counterConfiguration.ProcessIdCounterCategory);
 
                 string[] processInstanceNames = category.GetInstanceNames()
-                    .Where(inst => inst.StartsWith(currentProcess.ProcessName))
+                    .Where(inst => inst.ToLowerInvariant().StartsWith(currentProcess.ProcessName.ToLowerInvariant()))
                     .ToArray();
 
                 foreach (string processInstanceName in processInstanceNames)