[8.14] Loading playground test file (#182880) (#182887)

# Backport

This will backport the following commits from `main` to `8.14`:
- [Loading playground test file
(#182880)](#182880)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Samiul
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playground test file (#182880)\n\n## Summary\r\n\r\nLoading test file
for playground\r\n\r\n\r\n### Checklist\r\n\r\nDelete any items that are
not applicable to this PR.\r\n\r\n- [ ] Any text added follows [EUI's
writing\r\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\r\nsentence case text and includes
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was\r\nused on any tests changed\r\n- [ ] Any UI touched in this PR is
usable by keyboard only (learn more\r\nabout [keyboard
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touched in this PR does not create any new axe failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
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usable by keyboard only (learn more\r\nabout [keyboard
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touched in this PR does not create any new axe failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
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[ ] This renders correctly on smaller devices using a
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[ ] This was checked for
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For maintainers\r\n\r\n- [ ] This was checked for breaking API changes
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writing\r\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\r\nsentence case text and includes
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usable by keyboard only (learn more\r\nabout [keyboard
accessibility](https://webaim.org/techniques/keyboard/))\r\n- [ ] Any UI
touched in this PR does not create any new axe failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
[ ] If a plugin configuration key changed, check if it needs to
be\r\nallowlisted in the cloud and added to the
[docker\r\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\r\n-
[ ] This renders correctly on smaller devices using a
responsive\r\nlayout. (You can test this [in
your\r\nbrowser](https://www.browserstack.com/guide/responsive-testing-on-local-server))\r\n-
[ ] This was checked for
[cross-browser\r\ncompatibility](https://www.elastic.co/support/matrix#matrix_browsers)\r\n\r\n\r\n###
For maintainers\r\n\r\n- [ ] This was checked for breaking API changes
and was
[labeled\r\nappropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)","sha":"64a4c6dfaa3d174ffc2ab7120fbdf8bb0c372b2b"}}]}]
BACKPORT-->

Co-authored-by: Samiul Monir <150824886+Samiul-TheSoccerFan@users.noreply.github.com>

x-pack/test_serverless/functional/test_suites/search/index.ts

@@ -19,6 +19,7 @@ export default function ({ loadTestFile }: FtrProviderContext) {
     loadTestFile(require.resolve('./advanced_settings'));
     loadTestFile(require.resolve('./rules/rule_details'));
     loadTestFile(require.resolve('./console_notebooks'));
+    loadTestFile(require.resolve('./playground_overview'));
 
     loadTestFile(require.resolve('./ml'));
   });