Add issues to boards list
What does this MR do?
Removes the backlog list from issue boards & instead places this list into a modal window. From here the user can add multiple issues at a time into a list of their choosing.
Few things to note:
- The add issues button is disabled if no lists exist in the board
- De-selecting issues on the selected tab keeps them there until the tab changes
- Removing issues from the board is done by button in sidebar (visible by clicking issue card)
Screenshots (if relevant)
What are the relevant issue numbers?
Closes #26205 (closed)