[7.x] Skip Google Cloud Storage tests on JDK (elastic#74763)

See elastic#53119 for more context about why those tests 
are muted on JDK8.

They start failing more often recently now elastic#74313 
and elastic#74620 have been merged, as reported in elastic#74739.

Author: tlrx

plugins/repository-gcs/src/internalClusterTest/java/org/elasticsearch/repositories/gcs/GoogleCloudStorageThirdPartyTests.java

@@ -15,6 +15,7 @@
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.repositories.AbstractThirdPartyRepositoryTestCase;
+import org.junit.BeforeClass;
 
 import java.util.Base64;
 import java.util.Collection;
@@ -25,6 +26,11 @@
 
 public class GoogleCloudStorageThirdPartyTests extends AbstractThirdPartyRepositoryTestCase {
 
+    @BeforeClass
+    public static void skipJava8() {
+        GoogleCloudStorageBlobStoreRepositoryTests.assumeNotJava8();
+    }
+
     @Override
     protected Collection<Class<? extends Plugin>> getPlugins() {
         return pluginList(GoogleCloudStoragePlugin.class);

x-pack/plugin/repositories-metering-api/qa/gcs/src/test/java/org/elasticsearch/xpack/repositories/metering/gcs/GCSRepositoriesMeteringIT.java

@@ -7,13 +7,23 @@
 package org.elasticsearch.xpack.repositories.metering.gcs;
 
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.jdk.JavaVersion;
 import org.elasticsearch.xpack.repositories.metering.AbstractRepositoriesMeteringAPIRestTestCase;
+import org.junit.BeforeClass;
 
 import java.util.List;
 import java.util.Map;
 
 public class GCSRepositoriesMeteringIT extends AbstractRepositoriesMeteringAPIRestTestCase {
 
+    @BeforeClass
+    public static void skipJava8() {
+        assumeFalse("This test is flaky on jdk8 - we suspect a JDK bug to trigger some assertion in the HttpServer implementation used " +
+            "to emulate the server side logic of Google Cloud Storage. See https://bugs.openjdk.java.net/browse/JDK-8180754, " +
+            "https://github.com/elastic/elasticsearch/pull/51933 and https://github.com/elastic/elasticsearch/issues/52906 " +
+            "for more background on this issue.", JavaVersion.current().equals(JavaVersion.parse("8")));
+    }
+
     @Override
     protected String repositoryType() {
         return "gcs";

x-pack/plugin/searchable-snapshots/qa/gcs/src/test/java/org/elasticsearch/xpack/searchablesnapshots/GCSSearchableSnapshotsIT.java

@@ -8,12 +8,22 @@
 package org.elasticsearch.xpack.searchablesnapshots;
 
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.jdk.JavaVersion;
+import org.junit.BeforeClass;
 
 import static org.hamcrest.Matchers.blankOrNullString;
 import static org.hamcrest.Matchers.not;
 
 public class GCSSearchableSnapshotsIT extends AbstractSearchableSnapshotsRestTestCase {
 
+    @BeforeClass
+    public static void skipJava8() {
+        assumeFalse("This test is flaky on jdk8 - we suspect a JDK bug to trigger some assertion in the HttpServer implementation used " +
+            "to emulate the server side logic of Google Cloud Storage. See https://bugs.openjdk.java.net/browse/JDK-8180754, " +
+            "https://github.com/elastic/elasticsearch/pull/51933 and https://github.com/elastic/elasticsearch/issues/52906 " +
+            "for more background on this issue.", JavaVersion.current().equals(JavaVersion.parse("8")));
+    }
+
     @Override
     protected String writeRepositoryType() {
         return "gcs";