[8.19] Update onboarding footer (#218841) (#221869)

# Backport

This will backport the following commits from `main` to `8.19`:
- [Update onboarding footer
(#218841)](#218841)

<!--- Backport version: 10.0.0 -->

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

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Serverless\n\n![footer_light_serverless](https://github.com/user-attachments/assets/f8c23915-af1a-4e74-83d0-bdf5293d7494)\n\n![footer_dark_serverless](https://github.com/user-attachments/assets/f6407b57-fa47-488c-902c-be83ea5f39bc)\n\n###
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Self
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Self
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BACKPORT-->

Co-authored-by: kibanamachine <[email protected]>

Author: angorayc