Add "Give feedback" button (#180942)

## Summary

Closes https://github.com/elastic/kibana/issues/180825


![image](12a5a362-28c3-4837-b7ca-d33640333ac7)

### Checklist

Delete any items that are not applicable to this PR.

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [x] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)


### For maintainers

- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

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

x-pack/plugins/serverless/public/plugin.tsx

@@ -5,8 +5,11 @@
  * 2.0.
  */
 
+import { EuiButton } from '@elastic/eui';
 import { InternalChromeStart } from '@kbn/core-chrome-browser-internal';
 import { CoreSetup, CoreStart, Plugin, PluginInitializerContext } from '@kbn/core/public';
+import { i18n } from '@kbn/i18n';
+import { toMountPoint } from '@kbn/react-kibana-mount';
 import { KibanaRenderContextProvider } from '@kbn/react-kibana-context-render';
 import { ProjectSwitcher, ProjectSwitcherKibanaProvider } from '@kbn/serverless-project-switcher';
 import { ProjectType } from '@kbn/serverless-types';
@@ -77,6 +80,27 @@ export class ServerlessPlugin
     const activeNavigationNodes$ = project.getActiveNavigationNodes$();
     const navigationTreeUi$ = project.getNavigationTreeUi$();
 
+    core.chrome.navControls.registerRight({
+      order: 1,
+      mount: toMountPoint(
+        <KibanaRenderContextProvider i18n={core.i18n} theme={core.theme}>
+          <EuiButton
+            href="https://ela.st/serverless-feedback"
+            size={'s'}
+            color={'warning'}
+            iconType={'popout'}
+            iconSide={'right'}
+            target={'_blank'}
+          >
+            {i18n.translate('xpack.serverless.header.giveFeedbackBtn.label', {
+              defaultMessage: 'Give feedback',
+            })}
+          </EuiButton>
+        </KibanaRenderContextProvider>,
+        { ...core }
+      ),
+    });
+
     return {
       setSideNavComponentDeprecated: (sideNavigationComponent) =>
         project.setSideNavComponent(sideNavigationComponent),

x-pack/plugins/serverless/tsconfig.json

@@ -26,6 +26,7 @@
     "@kbn/shared-ux-chrome-navigation",
     "@kbn/i18n",
     "@kbn/management-cards-navigation",
+    "@kbn/react-kibana-mount",
     "@kbn/react-kibana-context-render",
   ]
 }