Add more verification in EventPipe rundownvalidation test.

Subtle changes like:
dotnet@2f2aaae

Knocked out a couple of rundown events on Mono that was detected and
fixed in dotnet#88634.

It would been ideal to catch this issue as part of CI, but turns out
that our existing rundownvalidation test only tests a couple of rundown
events, and not any of the module/assembly events that was affected by
above change.

This commit adds validation that the following additional rundown events
are included in the rundown event stream:

RuntimeStart
MethodDCStopInit
MethodDCStopComplete
LoaderModuleDCStop
LoaderDomainModuleDCStop
LoadAssemblyDCStop
LoadAppDomainDCStop

src/tests/tracing/eventpipe/rundownvalidation/rundownvalidation.cs

@@ -42,12 +42,30 @@ public static int Main()
 
         private static Func<EventPipeEventSource, Func<int>> _DoesRundownContainMethodEvents = (source) =>
         {
+            bool hasRuntimeStart = false;
+            bool hasMethodDCStopInit = false;
+            bool hasMethodDCStopComplete = false;
+            bool hasLoaderModuleDCStop = false;
+            bool hasLoaderDomainModuleDCStop = false;
+            bool hasAssemblyModuleDCStop = false;
             bool hasMethodDCStopVerbose = false;
             bool hasMethodILToNativeMap = false;
+            bool hasAppDomainDCStop = false;
+
             ClrRundownTraceEventParser rundownParser = new ClrRundownTraceEventParser(source);
+            rundownParser.RuntimeStart += (eventData) => hasRuntimeStart = true;
+            rundownParser.MethodDCStopInit += (eventData) => hasMethodDCStopInit = true;
+            rundownParser.MethodDCStopComplete += (eventData) => hasMethodDCStopComplete = true;
+            rundownParser.LoaderModuleDCStop += (eventData) => hasLoaderModuleDCStop = true;
+            rundownParser.LoaderDomainModuleDCStop += (eventData) => hasLoaderDomainModuleDCStop = true;
+            rundownParser.LoaderAssemblyDCStop += (eventData) => hasAssemblyModuleDCStop = true;
             rundownParser.MethodDCStopVerbose += (eventData) => hasMethodDCStopVerbose = true;
             rundownParser.MethodILToNativeMapDCStop += (eventData) => hasMethodILToNativeMap = true;
-            return () => hasMethodDCStopVerbose && hasMethodILToNativeMap ? 100 : -1;
+            rundownParser.LoaderAppDomainDCStop += (eventData) => hasAppDomainDCStop = true;
+            return () =>
+                hasRuntimeStart && hasMethodDCStopInit && hasMethodDCStopComplete &&
+                hasLoaderModuleDCStop && hasLoaderDomainModuleDCStop && hasAssemblyModuleDCStop &&
+                hasMethodDCStopVerbose && hasMethodILToNativeMap && hasAppDomainDCStop ? 100 : -1;
         };
     }
 }