Allow multiple custom forms to be removed at once

[#1]

Description - During the conversion or edit of a project, we'd like to be able to remove multiple custom forms at once to save time.

Why is this feature important to you - It would save our teams quite a bit of time with the volume of projects we convert and edit throughout the year.

How would you like the feature to work - Allow multiple forms to be selected before the user clicks "Remove" during the project conversion or editing process.

Current Behaviour - You need to select one, click remove, select the next, click remove, and so on.