fix(aspnetcore): guard DiagnosticListener reflection from TargetInvocationException

Wrap GetPropertyValue in try-catch to prevent PropertyInfo.GetValue
from throwing through OnNext, which violates the IObserver<T> contract
and could cause DiagnosticListener to permanently unsubscribe the
observer, silently breaking all exception reporting.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: niemyjski

src/Platforms/Exceptionless.AspNetCore/ExceptionlessDiagnosticListener.cs

@@ -70,9 +70,13 @@ private static object GetPropertyValue(object payload, string propertyName) {
             if (payload is null)
                 return null;
 
-            return payload.GetType()
-                .GetProperty(propertyName, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.IgnoreCase)?
-                .GetValue(payload);
+            try {
+                return payload.GetType()
+                    .GetProperty(propertyName, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.IgnoreCase)?
+                    .GetValue(payload);
+            } catch {
+                return null;
+            }
         }
     }
 }