* CustomScrollbar: migrated styles from sass to emotion
* fixes frontend test
* updated changes
* fixed page props and applied changes to all occurences
* moved the getStyles function to the bottom of the file
* made some changes
* fixed snapshot test
* Revert "Merge branch 'refactor-customscrollbar-30354' of https://github.com/grafana/grafana into refactor-customscrollbar-30354"
This reverts commit c45ee30b6b297991a1628e9b21c4121dc78e376c, reversing
changes made to d2645534e39c4ffda30a948f4a892c1c68ec38ca.
* improved props name
* made use of theme variables for style consistency
* fixed snapshot test and updated some theme changes
* removed hover effects from customScrollbar style
* made some changes
* updated some changes
* added label to class names
* changed to a functional component and improved styling
* fixes snapshot test
* fixes small nit
* minor tweaks
Co-authored-by: Torkel Ödegaard <torkel@grafana.com>
