R1:e0c95bca8631

Add a "Batch Edit Tasks..." action to workboard columns

Summary:
Ref T5523. Adds a new workflow to make some kinds of bulk workboard operations easier.

New dropdown action:

{F376848}

This brings you into the existing bulk edit flow:

{F376849}

When you save an edit, you're taken back to the board:

{F376850}

If you try to edit a column with nothing in it, you get an error:

{F376851}

Note that the selected workboard filter is applied before choosing tasks, so if your filter is set to "open tasks" we…