This commit adds a tab for assignments in the experimental user menu. The assignments tab behaves very similarly to the bookmarks and messages tab in core: it displays the user's unread assign notifications first and then fills the rest of available space in the menu with assignments (same content that the current user menu displays).
More details of the experimental user menu can be found in https://github.com/discourse/discourse/pull/17379.
Build a new workflow that adds a dropdown in place of the old assign button with the ability to
Re-assign a new user / group to an assigned topic
Re-assign yourself to an assigned topic
Unassign a user / group from an assigned topic
Osama Sayegh
janzenisaac
Ahmed Gagan
Bianca Nenciu
romanrizzi
Guo Xiang Tan
Robin Ward