ext/mysqli: Work on making tests parallizable (#11814)

Batch 1 of amending tests, so they can run in parallel.

Co-authored-by: Kamil Tekiela <tekiela246@gmail.com>

Author: Girgias

ext/mysqli/tests/001.phpt

@@ -2,13 +2,16 @@
 mysqli connect
 --EXTENSIONS--
 mysqli
+--CONFLICTS--
+mysqli
 --SKIPIF--
 <?php
 require_once 'skipifconnectfailure.inc';
 ?>
 --FILE--
 <?php
-    require_once 'connect.inc';
+// TODO Not conflicting with parallel?
+    require_once("connect.inc");
 
     $test = "";