Timeboxed to 5

Usage of this extension seems obsolete after MGNLUI-6242 as the grid now scroll to the selected item (tree) or lists selected items at top (list).

We still use one method though (#adjustColumnWidth).

We even had to fix issue with this extension, see https://git.magnolia-cms.com/projects/PLATFORM/repos/vaadin-compatibility-addons/browse/vaadin-compatibility-grid-scroll-extension

Steps to do

• Removal from framework grids 
• Removal from FindBar
• Removal from widgetset
• (possibly new ticket) remove custom fix in vaadin addons

Acceptance criteria

• ensure there are no infinite polls when you open up an app with a grid when any of your workspaces have a lot of data in it.
  • For that, you can use [^pageCreationScript] this script in Groovy Module to fill page workspace with 50000 nodes. Then open up any app, even an empty one, and observe in DevTools that there's infinite polling taking place. It will look very much like in this video [^2020-11-09 10-15-33.mp4] 
• Ensure no critical functionality was lost with the removal of the extension
• Also, consider
  • drop maintenance of our custom fix
  • drop dependency to 3rd party widgets