[Data Discovery] Remove SO client usages (#224495)

## Summary

While checking out our remaining browser SO client usages, I realized it
would be _really_ easy to get rid of them. This PR does that.

Resolves #224357.

### Checklist

- [ ] 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/src/platform/packages/shared/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

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

examples/discover_customization_examples/kibana.jsonc

@@ -12,7 +12,8 @@
       "discover",
       "embeddable",
       "kibanaUtils",
-      "data"
+      "data",
+      "savedSearch"
     ]
   }
 }

examples/discover_customization_examples/public/plugin.tsx

@@ -25,6 +25,9 @@ import { Route, Router, Routes } from '@kbn/shared-ux-router';
 import { I18nProvider } from '@kbn/i18n-react';
 import { KibanaThemeProvider } from '@kbn/react-kibana-context-theme';
 import { DataPublicPluginStart } from '@kbn/data-plugin/public';
+import { SavedSearchPublicPluginStart } from '@kbn/saved-search-plugin/public';
+import type { SOWithMetadata } from '@kbn/content-management-utils';
+import type { SavedSearchAttributes } from '@kbn/saved-search-plugin/common';
 import image from './discover_customization_examples.png';
 
 export interface DiscoverCustomizationExamplesSetupPlugins {
@@ -35,6 +38,7 @@ export interface DiscoverCustomizationExamplesSetupPlugins {
 export interface DiscoverCustomizationExamplesStartPlugins {
   discover: DiscoverStart;
   data: DataPublicPluginStart;
+  savedSearch: SavedSearchPublicPluginStart;
 }
 
 const PLUGIN_ID = 'discoverCustomizationExamples';
@@ -112,15 +116,13 @@ export class DiscoverCustomizationExamplesPlugin implements Plugin {
           const togglePopover = () => setIsPopoverOpen((open) => !open);
           const closePopover = () => setIsPopoverOpen(false);
           const [savedSearches, setSavedSearches] = useState<
-            Array<SimpleSavedObject<{ title: string }>>
+            Array<SOWithMetadata<SavedSearchAttributes>>
           >([]);
 
           useEffect(() => {
-            core.savedObjects.client
-              .find<{ title: string }>({ type: 'search' })
-              .then((response) => {
-                setSavedSearches(response.savedObjects);
-              });
+            plugins.savedSearch.getAll().then((response) => {
+              setSavedSearches(response);
+            });
           }, []);
 
           const currentSavedSearch = useObservable(
@@ -154,7 +156,7 @@ export class DiscoverCustomizationExamplesPlugin implements Plugin {
                       id: 0,
                       title: 'Saved logs views',
                       items: savedSearches.map((savedSearch) => ({
-                        name: savedSearch.get('title'),
+                        name: savedSearch.attributes.title,
                         onClick: () => stateContainer.actions.onOpenSavedSearch(savedSearch.id),
                         icon: savedSearch.id === currentSavedSearch.id ? 'check' : 'empty',
                         'data-test-subj': `logsViewSelectorOption-${savedSearch.attributes.title.replace(

examples/discover_customization_examples/tsconfig.json

@@ -13,6 +13,8 @@
     "@kbn/i18n-react",
     "@kbn/react-kibana-context-theme",
     "@kbn/data-plugin",
+    "@kbn/saved-search-plugin",
+    "@kbn/content-management-utils",
   ],
   "exclude": ["target/**/*"]
 }