Pass idleTimeout to DbConnectionPoolGroupOptions in budget test

WaitHandleDbConnectionPoolBudgetTest was added in main while this branch
was in flight; updating its DbConnectionPoolGroupOptions construction to
pass idleTimeout: 0 fixes the CS7036 net462 build error.

Author: priyankatiwari08

src/Microsoft.Data.SqlClient/tests/UnitTests/ConnectionPool/WaitHandleDbConnectionPoolBudgetTest.cs

@@ -47,7 +47,8 @@ private WaitHandleDbConnectionPool CreatePool(
             maxPoolSize: maxPoolSize,
             creationTimeout: creationTimeoutMs,
             loadBalanceTimeout: 0,
-            hasTransactionAffinity: true);
+            hasTransactionAffinity: true,
+            idleTimeout: 0);
 
         var dbConnectionPoolGroup = new DbConnectionPoolGroup(
             new SqlConnectionOptions("Data Source=localhost;"),