Selecting Unassigned selects `Any Assignee` on the UI

As seen on master, not deployed on gitlab.com yet. Looks like a regression from !10767 (merged)

/cc @samrose3

added frontend regression labels

@ClemMakesApps ahhhh... shoot. Good catch. I'm on it

assigned to @samrose3

created branch 31843-selecting-unassigned-selects-any-assignee-on-the-ui

mentioned in merge request !11147 (closed)

assigned to @jivanvl

mentioned in merge request !11391 (merged)

assigned to @ClemMakesApps

@ClemMakesApps Assigning to you since you have an open MR for it

Yep, thanks @jivanvl

closed via merge request !11391 (merged)

changed milestone to %9.2

mentioned in commit f12d7db1