Don't use create static storage service

Even though you annotate the Test class with `@ThirdParty` the static
code is initialized.

In that case it fails with:

```
==> Test Info: seed=529C3C6977F695FC; jvms=3; suites=6
Suite: org.elasticsearch.repositories.azure.AzureSnapshotRestoreTests
ERROR   0.00s J2 | AzureSnapshotRestoreTests (suite) <<< FAILURES!
   > Throwable #1: java.lang.IllegalStateException: to run integration tests, you need to set -Dtests.thirdparty=true and -Dtests.azure.account=azure-account -Dtests.azure.key=azure-key
   >    at org.elasticsearch.cloud.azure.AzureTestUtils.generateMockSecureSettings(AzureTestUtils.java:37)
   >    at org.elasticsearch.repositories.azure.AzureSnapshotRestoreTests.generateMockSettings(AzureSnapshotRestoreTests.java:81)
   >    at org.elasticsearch.repositories.azure.AzureSnapshotRestoreTests.<clinit>(AzureSnapshotRestoreTests.java:84)
   >    at java.lang.Class.forName0(Native Method)
   >    at java.lang.Class.forName(Class.java:348)
Completed [1/6] on J2 in 2.21s, 0 tests, 1 error <<< FAILURES!
```

Closes elastic#26812.

plugins/repository-azure/src/test/java/org/elasticsearch/repositories/azure/AzureSnapshotRestoreTests.java

@@ -23,7 +23,6 @@
 import com.carrotsearch.randomizedtesting.RandomizedTest;
 import com.microsoft.azure.storage.LocationMode;
 import com.microsoft.azure.storage.StorageException;
-import org.apache.lucene.util.LuceneTestCase.AwaitsFix;
 import org.elasticsearch.action.admin.cluster.repositories.put.PutRepositoryResponse;
 import org.elasticsearch.action.admin.cluster.snapshots.create.CreateSnapshotResponse;
 import org.elasticsearch.action.admin.cluster.snapshots.restore.RestoreSnapshotResponse;
@@ -76,17 +75,16 @@
         supportsDedicatedMasters = false, numDataNodes = 1,
         transportClientRatio = 0.0)
 @ThirdParty
-@AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/26812")
 public class AzureSnapshotRestoreTests extends ESBlobStoreRepositoryIntegTestCase {
 
     private static Settings.Builder generateMockSettings() {
         return Settings.builder().setSecureSettings(generateMockSecureSettings());
     }
 
-    // disabled for https://github.com/elastic/elasticsearch/issues/26812
-    private static final AzureStorageService azureStorageService = null;
-    //private static final AzureStorageService azureStorageService = new AzureStorageServiceImpl(generateMockSettings().build(),
-    //    AzureStorageSettings.load(generateMockSettings().build()));
+    private static AzureStorageService getAzureStorageService() {
+        return new AzureStorageServiceImpl(generateMockSettings().build(),
+            AzureStorageSettings.load(generateMockSettings().build()));
+    }
 
     @Override
     protected Settings nodeSettings(int nodeOrdinal) {
@@ -129,7 +127,7 @@ private static void createTestContainer(String containerName) throws Exception {
         // It could happen that we run this test really close to a previous one
         // so we might need some time to be able to create the container
         assertBusy(() -> {
-            azureStorageService.createContainer("default", LocationMode.PRIMARY_ONLY, containerName);
+            getAzureStorageService().createContainer("default", LocationMode.PRIMARY_ONLY, containerName);
         }, 30, TimeUnit.SECONDS);
     }
 
@@ -138,7 +136,7 @@ private static void createTestContainer(String containerName) throws Exception {
      * @param containerName container name to use
      */
     private static void removeTestContainer(String containerName) throws URISyntaxException, StorageException {
-        azureStorageService.removeContainer("default", LocationMode.PRIMARY_ONLY, containerName);
+        getAzureStorageService().removeContainer("default", LocationMode.PRIMARY_ONLY, containerName);
     }
 
     @Override