[Inventory] Add Sharing button (#194535)

## Summary

Adds a Share link button to the Inventory page, next to the Add Data
button on the top right of the screen. This creates a short link and
copies it to the user's clipboard so they can share it.


https://github.com/user-attachments/assets/42c7b2f9-da19-4ced-8d28-211234bea4cf

## How to Test

- Log in and go to Inventory page. Ensure there is data loaded and
entities are showing.
- Put a filter on the inventory to restrict the results to a given
state, such as `entity.type : "service"`.
- Click on the `Share` button and wait until you get a success toast
message.
- Open a new empty tab on the browser and paste the link into the url
bar to navigate to the page.

**Expected Result**: The page should navigate to the Inventory page and
load into the same state as the page on the original browser tab.

Closes #192325

---------

Co-authored-by: Elastic Machine <[email protected]>

x-pack/plugins/observability_solution/inventory/public/components/app_root/header_action_menu/index.tsx

@@ -8,10 +8,12 @@
 import React from 'react';
 import { EuiHeaderLinks } from '@elastic/eui';
 import { AddDataContextMenu } from './add_data_action_menu';
+import { ShareLink } from './share_link';
 
 export function HeaderActionMenuItems() {
   return (
     <EuiHeaderLinks gutterSize="xs">
+      <ShareLink />
       <AddDataContextMenu />
     </EuiHeaderLinks>
   );

x-pack/plugins/observability_solution/inventory/public/components/app_root/header_action_menu/share_link.tsx

@@ -0,0 +1,82 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import React, { useCallback, useState } from 'react';
+import copy from 'copy-to-clipboard';
+import { i18n } from '@kbn/i18n';
+import { EuiButtonEmpty } from '@elastic/eui';
+import { useKibana } from '../../../hooks/use_kibana';
+
+const SHARE_BUTTON_LABEL = i18n.translate('xpack.inventory.shareLink.shareButtonLabel', {
+  defaultMessage: 'Share',
+});
+
+const SHARE_TOAST_SUCCESS_LABEL = i18n.translate(
+  'xpack.inventory.shareLink.shareToastSuccessLabel',
+  { defaultMessage: 'Short URL copied to clipboard!' }
+);
+
+const SHARE_TOAST_FAILURE_LABEL = i18n.translate(
+  'xpack.inventory.shareLink.shareToastFailureLabel',
+  { defaultMessage: 'Short URL unable to be copied.' }
+);
+
+function useShortUrlService() {
+  const {
+    services: { share, notifications },
+  } = useKibana();
+
+  const [isLoading, setIsLoading] = useState(false);
+
+  const copyShortUrl = useCallback(async () => {
+    setIsLoading(true);
+
+    try {
+      const shortUrls = share.url.shortUrls.get(null);
+
+      const { url } = await shortUrls.createFromLongUrl(window.location.toString());
+
+      setIsLoading(false);
+
+      if (copy(url)) {
+        notifications.toasts.addSuccess({
+          title: SHARE_TOAST_SUCCESS_LABEL,
+          iconType: 'copyClipboard',
+        });
+      } else {
+        throw new Error('Clipboard copy error');
+      }
+    } catch (e) {
+      const err = e as Error;
+      notifications.toasts.addDanger({
+        title: SHARE_TOAST_FAILURE_LABEL,
+        iconType: 'error',
+        text: err.message,
+      });
+    }
+  }, [share, notifications.toasts]);
+
+  return {
+    isLoading,
+    copyShortUrl,
+  };
+}
+
+export function ShareLink() {
+  const { isLoading, copyShortUrl } = useShortUrlService();
+
+  return (
+    <EuiButtonEmpty
+      data-test-subj="inventoryShareLinkButton"
+      onClick={copyShortUrl}
+      iconType="share"
+      isLoading={isLoading}
+    >
+      {SHARE_BUTTON_LABEL}
+    </EuiButtonEmpty>
+  );
+}