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What type of PR is this? (check all applicable)
Description
A popular tag with a long name causes a horizontal scrollbar in the sidebar

This PR truncates long tags and shows ellipses on text overflow.
Related Tickets & Documents
Resolves #10990
QA Instructions, Screenshots, Recordings
rails consolecreate a new tag. Tags must be marked assupportedto appear in the sidebar. Eg:hotness_scoreso that it appears in the list.For reference: Here's the query that generates the popular tag list
forem/app/views/articles/_sidebar_nav.html.erb
Line 81 in 4dde307
/Sidebar after changes

Added tests?
Added to documentation?