[ML] Load data streams plugin for ML internal cluster tests (#63560)

Now that deprecation logs get indexed to a data stream, if we
do not load the data stream plugin in our tests and any test
generates a deprecation log message then millions of exceptions
get logged, slowing down the tests to the extent that they can
fail.

This change loads the data streams plugin during the ML internal
cluster tests.  (It should already be present in external cluster
tests.)

Fixes #63548

Author: droberts195

x-pack/plugin/ml/build.gradle

@@ -50,6 +50,7 @@ dependencies {
   compileOnly project(path: xpackModule('core'), configuration: 'default')
   testImplementation project(path: xpackModule('core'), configuration: 'testArtifacts')
   testImplementation project(path: xpackModule('ilm'), configuration: 'default')
+  testImplementation project(path: xpackModule('data-streams'), configuration: 'default')
   // This should not be here
   testImplementation project(path: xpackModule('security'), configuration: 'testArtifacts')
 

x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/support/BaseMlIntegTestCase.java

@@ -58,6 +58,7 @@
 import org.elasticsearch.xpack.core.ml.job.config.Job;
 import org.elasticsearch.xpack.core.ml.job.config.JobState;
 import org.elasticsearch.xpack.core.ml.job.process.autodetect.state.DataCounts;
+import org.elasticsearch.xpack.datastreams.DataStreamsPlugin;
 import org.elasticsearch.xpack.ilm.IndexLifecycle;
 import org.elasticsearch.xpack.ml.LocalStateMachineLearning;
 import org.elasticsearch.xpack.ml.MachineLearning;
@@ -124,7 +125,9 @@ protected Collection<Class<? extends Plugin>> nodePlugins() {
             CommonAnalysisPlugin.class,
             ReindexPlugin.class,
             // ILM is required for .ml-state template index settings
-            IndexLifecycle.class);
+            IndexLifecycle.class,
+            // Deprecation warnings go to a data stream, if we ever cause a deprecation warning the data streams plugin is required
+            DataStreamsPlugin.class);
     }
 
     @Override