feat(ui): rename slow requests metric to over 1s

Author: georgidhristov

DebugProbe.AspNetCore/Assets/html/index.html

@@ -17,7 +17,7 @@ <h2>Requests</h2>
         </div>
         <div class="stat-tile">
             <strong>{{slow_requests}}</strong>
-            <span>Slow</span>
+            <span>Over 1s</span>
         </div>
         <div class="stat-tile">
             <strong>{{error_rate}}</strong>