[Search] Revert renaming of playground to RAG playground (#234070)

## Summary

This PR reverts the changes made in
#232136, and renames RAG
Playground back to Playground.

### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [ ] ~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)
- [ ] ~Review the [backport
guidelines]~(https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)
and apply applicable `backport:*` labels.~

Author: seialkali

x-pack/solutions/search/plugins/search_homepage/public/components/sample_data_action_button.tsx

@@ -99,7 +99,7 @@ export const SampleDataActionButton = ({ clickEvent = AnalyticsEvents.installSam
               <EuiContextMenuItem key="playground" onClick={navigateToPlayground} icon="comment">
                 <FormattedMessage
                   id="xpack.searchHomepage.sampleData.linkToPlayground"
-                  defaultMessage="RAG Playground"
+                  defaultMessage="Playground"
                 />
               </EuiContextMenuItem>,
               <EuiContextMenuItem key="index" onClick={navigateToIndexDetails} icon="index">

x-pack/solutions/search/plugins/search_indices/public/components/indices/details_page.tsx

@@ -256,7 +256,7 @@ export const SearchIndexDetailsPage = () => {
                       >
                         <FormattedMessage
                           id="xpack.searchIndices.indexAction.useInPlaygroundButtonLabel"
-                          defaultMessage="Search in RAG Playground"
+                          defaultMessage="Search in Playground"
                         />
                       </EuiButton>
                     </EuiFlexItem>

x-pack/solutions/search/plugins/search_indices/public/components/indices/details_search_example.tsx

@@ -72,7 +72,7 @@ export const IndexSearchExample = ({
           <h5>
             <FormattedMessage
               id="xpack.searchIndices.indexDetail.searchExample.playground.title"
-              defaultMessage="RAG Playground"
+              defaultMessage="Playground"
             />
           </h5>
         </EuiTitle>
@@ -94,7 +94,7 @@ export const IndexSearchExample = ({
           >
             <FormattedMessage
               id="xpack.searchIndices.indexDetail.searchExample.playground.cta"
-              defaultMessage="Search in RAG Playground"
+              defaultMessage="Search in Playground"
             />
           </EuiButton>
         </div>

x-pack/solutions/search/plugins/search_indices/public/components/shared/sample_data_action_button.tsx

@@ -95,7 +95,7 @@ export const SampleDataActionButton: React.FC<SampleDataActionButtonProps> = ({
               <EuiContextMenuItem key="playground" onClick={navigateToPlayground} icon="comment">
                 <FormattedMessage
                   id="xpack.searchIndices.shared.createIndex.ingestSampleData.linkToPlayground"
-                  defaultMessage="RAG Playground"
+                  defaultMessage="Playground"
                 />
               </EuiContextMenuItem>,
               <EuiContextMenuItem

x-pack/solutions/search/plugins/search_playground/common/index.ts

@@ -12,7 +12,7 @@ export { SearchPlaygroundQueryKeys, SearchPlaygroundMutationKeys } from './query
 
 export const PLUGIN_ID = 'searchPlayground';
 export const PLUGIN_NAME = i18n.translate('xpack.searchPlayground.plugin.name', {
-  defaultMessage: 'RAG Playground',
+  defaultMessage: 'Playground',
 });
 export const PLUGIN_PATH = '/app/search_playground';
 

x-pack/solutions/search/plugins/search_playground/public/components/chat_sidebar.tsx

@@ -24,7 +24,7 @@ export const ChatSidebar: React.FC = () => {
     },
     {
       title: i18n.translate('xpack.searchPlayground.sidebar.contextTitle', {
-        defaultMessage: 'RAG Playground context',
+        defaultMessage: 'Playground context',
       }),
       extraAction: (
         <EuiLink

x-pack/solutions/search/plugins/search_playground/public/components/header.tsx

@@ -85,7 +85,7 @@ export const Header: React.FC<HeaderProps> = ({
             <h2>
               <FormattedMessage
                 id="xpack.searchPlayground.unsaved.pageTitle"
-                defaultMessage="Unsaved RAG playground"
+                defaultMessage="Unsaved playground"
               />
             </h2>
           </EuiTitle>

x-pack/solutions/search/plugins/search_playground/public/components/not_found.tsx

@@ -54,7 +54,7 @@ export const PlaygroundRouteNotFound = () => {
         actions={
           <EuiButton data-test-subj="playgroundRouteNotFoundCTA" onClick={goToPlayground} fill>
             {i18n.translate('xpack.searchPlayground.notFound.action1', {
-              defaultMessage: 'Back to RAG Playground',
+              defaultMessage: 'Back to Playground',
             })}
           </EuiButton>
         }

x-pack/solutions/search/plugins/search_playground/public/components/playground_header_docs.tsx

@@ -23,7 +23,7 @@ export const PlaygroundHeaderDocs: React.FC = () => (
     size="s"
   >
     {i18n.translate('xpack.searchPlayground.pageTitle.header.docLink', {
-      defaultMessage: 'RAG Playground Docs',
+      defaultMessage: 'Playground Docs',
     })}
   </EuiButtonEmpty>
 );

x-pack/solutions/search/plugins/search_playground/public/components/playgrounds_list/empty_state/body.tsx

@@ -37,7 +37,7 @@ export const PlaygroundsListEmptyStateBody = ({
           >
             <FormattedMessage
               id="xpack.searchPlayground.playgroundsList.emptyPrompt.cta.text"
-              defaultMessage="New RAG Playground"
+              defaultMessage="New Playground"
             />
           </EuiButton>
         </span>