Add support for S3 intelligent tiering in Snapshot and Restore (#149129)

Closes https://github.com/elastic/kibana/issues/136682

## Summary

This PR adds the "intelligent_tiering" option to the Storage class field
in the Repository form for AWS S3.

<img width="1299" alt="Screenshot 2023-01-18 at 14 40 10"
src="https://user-images.githubusercontent.com/59341489/213200327-60766fca-3261-4441-bc33-463a3d73d0e1.png">

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/snapshot_restore/__jest__/client_integration/helpers/repository_add.helpers.ts

@@ -135,6 +135,7 @@ type TestSubjects =
   | 'stepTwo.readOnlyToggle'
   | 'stepTwo.submitButton'
   | 'stepTwo.title'
+  | 'storageClassSelect'
   | 'submitButton'
   | 'title'
   | 'urlRepositoryType';

x-pack/plugins/snapshot_restore/__jest__/client_integration/repository_add.test.ts

@@ -545,4 +545,53 @@ describe('<RepositoryAdd />', () => {
       });
     });
   });
+
+  describe('settings for s3 repository', () => {
+    beforeEach(async () => {
+      httpRequestsMockHelpers.setLoadRepositoryTypesResponse(repositoryTypes);
+
+      testBed = await setup(httpSetup);
+    });
+
+    test('should correctly set the intelligent_tiering storage class', async () => {
+      const { form, actions, component } = testBed;
+
+      const s3Repository = getRepository({
+        type: 's3',
+        settings: {
+          bucket: 'test_bucket',
+          storageClass: 'intelligent_tiering',
+        },
+      });
+
+      // Fill step 1 required fields and go to step 2
+      form.setInputValue('nameInput', s3Repository.name);
+      actions.selectRepositoryType(s3Repository.type);
+      actions.clickNextButton();
+
+      // Fill step 2
+      form.setInputValue('bucketInput', s3Repository.settings.bucket);
+      form.setSelectValue('storageClassSelect', s3Repository.settings.storageClass);
+
+      await act(async () => {
+        actions.clickSubmitButton();
+      });
+
+      component.update();
+
+      expect(httpSetup.put).toHaveBeenLastCalledWith(
+        `${API_BASE_PATH}repositories`,
+        expect.objectContaining({
+          body: JSON.stringify({
+            name: s3Repository.name,
+            type: s3Repository.type,
+            settings: {
+              bucket: s3Repository.settings.bucket,
+              storageClass: s3Repository.settings.storageClass,
+            },
+          }),
+        })
+      );
+    });
+  });
 });

x-pack/plugins/snapshot_restore/public/application/components/repository_form/type_settings/s3_settings.tsx

@@ -71,7 +71,12 @@ export const S3Settings: React.FunctionComponent<Props> = ({
     });
   };
 
-  const storageClassOptions = ['standard', 'reduced_redundancy', 'standard_ia'].map((option) => ({
+  const storageClassOptions = [
+    'standard',
+    'reduced_redundancy',
+    'standard_ia',
+    'intelligent_tiering',
+  ].map((option) => ({
     value: option,
     text: option,
   }));