Fix SLMSnapshotBlockingIntegTest (#47941)

The after snapshot action is interfering with SLM deleting snapshots
here it seems, causing concurrent delete exceptions.
Since these tests are now test-scoped there is no reason to run
snapshot deletes after each test so we can remove them to avoid this issue.

Closes #47937

Author: original-brownbear

x-pack/plugin/ilm/src/test/java/org/elasticsearch/xpack/slm/SLMSnapshotBlockingIntegTests.java

@@ -37,7 +37,6 @@
 import org.elasticsearch.xpack.core.slm.action.GetSnapshotLifecycleAction;
 import org.elasticsearch.xpack.core.slm.action.PutSnapshotLifecycleAction;
 import org.elasticsearch.xpack.ilm.IndexLifecycle;
-import org.junit.After;
 import org.junit.Before;
 
 import java.util.Arrays;
@@ -73,23 +72,6 @@ public void ensureClusterNodes() {
         ensureGreen();
     }
 
-    @After
-    public void resetSLMSettings() throws Exception {
-        // Cancel/delete all snapshots
-        assertBusy(() -> {
-            logger.info("--> wiping all snapshots after test");
-            client().admin().cluster().prepareGetSnapshots(REPO).get().getSnapshots(REPO)
-                .forEach(snapshotInfo -> {
-                    try {
-                        client().admin().cluster().prepareDeleteSnapshot(REPO, snapshotInfo.snapshotId().getName()).get();
-                    } catch (Exception e) {
-                        logger.warn("exception cleaning up snapshot " + snapshotInfo.snapshotId().getName(), e);
-                        fail("exception cleanup up snapshot");
-                    }
-                });
-        });
-    }
-
     @Override
     protected Collection<Class<? extends Plugin>> nodePlugins() {
         return Arrays.asList(MockRepository.Plugin.class, LocalStateCompositeXPackPlugin.class, IndexLifecycle.class);
@@ -253,10 +235,8 @@ public void testRetentionWhileSnapshotInProgress() throws Exception {
         }
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/47937")
     public void testBasicFailureRetention() throws Exception {
         testUnsuccessfulSnapshotRetention(false);
-
     }
 
     public void testBasicPartialRetention() throws Exception {