Scroll only long sidebar in project workboard view instead of page
Summary:
Do not show a void of emptiness below the workboard columns section when scrolling down on a project workboard with a lot of items in the left sidebar.
Patch written by @A_smart_kitten.
Closes T16338
Test Plan:
* Create a workboard for a project.
* Add a lot of links to that workboard's sidebar menu via `/project/<project-id>/item/configure/global/`.
* Visit that workboard & attempt to scroll down the links in the left-hand sidebar.
* See that the entire page does not scroll anymore (exposing emptiness below the columns) but only the sidebar.
Reviewers: O1 Blessed Committers, aklapper, mainframe98
Reviewed By: O1 Blessed Committers, mainframe98
Subscribers: mainframe98, tobiaswiese, valerio.bozzolan, Matthew, A_smart_kitten, Cigaryno
Maniphest Tasks: T16338
Differential Revision: https://we.phorge.it/D26495
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