[8.x] [Lens/SCSS] Delete and migrate annotations.scss file (elastic#209074) (elastic#216156)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Lens/SCSS] Delete and migrate `annotations.scss` file
(elastic#209074)](elastic#209074)

<!--- Backport version: 9.6.6 -->

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

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Delete and migrate `annotations.scss` file (elastic#209074)\n\n##
Summary\n\nPart of
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Delete and migrate `annotations.scss` file (elastic#209074)\n\n##
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BACKPORT-->

---------

Co-authored-by: Maria Iriarte <[email protected]>
Co-authored-by: kibanamachine <[email protected]>
Co-authored-by: Nick Partridge <[email protected]>

Author: 4 people