[DOCS] Check for Windows and *nix file paths (#31648)

Proper cleanup of the docs snippet tests depends on detecting
what is being tested (ML, Watcher, etc) this is deduced from
the file path and so we must account for Windows and Unix path
separators

Author: davidkyle

x-pack/docs/src/test/java/org/elasticsearch/smoketest/XDocsClientYamlTestSuiteIT.java

@@ -104,7 +104,7 @@ public void reenableWatcher() throws Exception {
     @Override
     protected boolean isWatcherTest() {
         String testName = getTestName();
-        return testName != null && testName.contains("watcher/");
+        return testName != null && (testName.contains("watcher/") || testName.contains("watcher\\"));
     }
 
     @Override
@@ -115,13 +115,13 @@ protected boolean isMonitoringTest() {
     @Override
     protected boolean isMachineLearningTest() {
         String testName = getTestName();
-        return testName != null && testName.contains("ml/");
+        return testName != null && (testName.contains("ml/") || testName.contains("ml\\"));
     }
 
     @Override
     protected boolean isRollupTest() {
         String testName = getTestName();
-        return testName != null && testName.contains("rollup/");
+        return testName != null && (testName.contains("rollup/") || testName.contains("rollup\\"));
     }
 
     /**