[8.x] [Security Solution][Data Quality Dashboard][Serverless] Fix fet…

…chAvailableIndices in get_index_stats (elastic#197065) (elastic#198525)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Security Solution][Data Quality Dashboard][Serverless] Fix
fetchAvailableIndices in get_index_stats
(elastic#197065)](elastic#197065)

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

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

<!--BACKPORT [{"author":{"name":"Karen
Grigoryan","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-10-31T13:07:36Z","message":"[Security
Solution][Data Quality Dashboard][Serverless] Fix fetchAvailableIndices
in get_index_stats (elastic#197065)\n\naddresses elastic#196528\r\n\r\n- Remove unused
get_available_indices.ts params helper file.\r\n- Change
fetchAvailableIndices to use creation_date from _cat api\r\ninstead of
targeting @timestamp field of indices\r\n\r\n## UI
Changes:\r\n\r\nBefore:\r\n\r\n![image](https://github.com/user-attachments/assets/1954a8b6-1760-4ec7-b3d3-167b724f8b3c)\r\nAfter:\r\n\r\n![image](https://github.com/user-attachments/assets/232674a1-9691-4d49-862e-99873f22c3cf)\r\n\r\n---------\r\n\r\nCo-authored-by:
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get_available_indices.ts params helper file.\r\n- Change
fetchAvailableIndices to use creation_date from _cat api\r\ninstead of
targeting @timestamp field of indices\r\n\r\n## UI
Changes:\r\n\r\nBefore:\r\n\r\n![image](https://github.com/user-attachments/assets/1954a8b6-1760-4ec7-b3d3-167b724f8b3c)\r\nAfter:\r\n\r\n![image](https://github.com/user-attachments/assets/232674a1-9691-4d49-862e-99873f22c3cf)\r\n\r\n---------\r\n\r\nCo-authored-by:
kibanamachine
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Solution][Data Quality Dashboard][Serverless] Fix fetchAvailableIndices
in get_index_stats (elastic#197065)\n\naddresses elastic#196528\r\n\r\n- Remove unused
get_available_indices.ts params helper file.\r\n- Change
fetchAvailableIndices to use creation_date from _cat api\r\ninstead of
targeting @timestamp field of indices\r\n\r\n## UI
Changes:\r\n\r\nBefore:\r\n\r\n![image](https://github.com/user-attachments/assets/1954a8b6-1760-4ec7-b3d3-167b724f8b3c)\r\nAfter:\r\n\r\n![image](https://github.com/user-attachments/assets/232674a1-9691-4d49-862e-99873f22c3cf)\r\n\r\n---------\r\n\r\nCo-authored-by:
kibanamachine
<[email protected]>","sha":"ac013b4a99d68ac1596a19d94a7094b4284a200a"}}]}]
BACKPORT-->

Co-authored-by: Karen Grigoryan <[email protected]>