Remove unneeded test PreventFailingBuildIT (#52198)

Ironically PreventFailingBuildIT.testSoThatTestsDoNotFail is causing failures 
as documented in #52197. The no longer serves a purpose and can now be removed.

x-pack/qa/smoke-test-monitoring-with-watcher/src/test/java/org/elasticsearch/smoketest/PreventFailingBuildIT.java

@@ -1,18 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License;
- * you may not use this file except in compliance with the Elastic License.
- */
-package org.elasticsearch.smoketest;
-
-import org.elasticsearch.test.ESIntegTestCase;
-
-public class PreventFailingBuildIT extends ESIntegTestCase {
-
-    public void testSoThatTestsDoNotFail() {
-        // Noop
-
-        // This is required because if tests are not enable no
-        // tests will be run in the entire project and all tests will fail.
-    }
-}