Implement hovering for unsorted columns in Alert Management List table
This is a follow-up issue to implement hovering on the alert management list table (and by extension, all sortable tables in GitLab).
Design is as follows:
![image](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
Edited
by
Laura Montemayor