Additional fixes to slow request testing.

Author: rhamlett_microsoft

src/PerfProblemSimulator/wwwroot/index.html

@@ -254,6 +254,6 @@ <h2>📜 Event Log</h2>
         <p>Last Update: <span id="lastUpdate">--</span></p>
     </footer>
 
-    <script src="js/dashboard.js"></script>
+    <script src="js/dashboard.js?v=2"></script>
 </body>
 </html>

src/PerfProblemSimulator/wwwroot/js/dashboard.js

@@ -689,6 +689,9 @@ function updateLatencyChart() {
  * This runs independently in the browser and won't be affected by server thread pool issues.
  */
 function startClientProbe() {
+    // Idempotency check: Don't start if already running
+    if (state.isClientProbeRunning) return;
+
     // Use a flag to track running state
     state.isClientProbeRunning = true;