Test | Improve MaxPoolWaitForConnectionTest waiting time (#1465)

Author: Kaur-Parminder

src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectionPoolTest/ConnectionPoolTest.cs

@@ -185,7 +185,11 @@ public static void MaxPoolWaitForConnectionTest(string connectionString)
             ManualResetEventSlim taskAllowedToSpeak = new ManualResetEventSlim(false);
 
             Task waitTask = Task.Factory.StartNew(() => MaxPoolWaitForConnectionTask(newConnectionString, internalConnection, connectionPool, taskAllowedToSpeak));
-            Thread.Sleep(200);
+            int count = 5;
+            while (waitTask.Status == TaskStatus.WaitingToRun && count-- > 0)
+            {
+                Thread.Sleep(200);
+            }
             Assert.Equal(TaskStatus.Running, waitTask.Status);
 
             connection1.Close();