Improve mass data set change on cards

Prospero

When creating a new dashboard my team frequently needs to duplicate an existing one, including cards, and then update the data source for each card one by one.

The current system only allows users to migrate ALL CARDS associated with a data set. If I duplicate, I have:

1. the originals
2. the dupilcates

I just want to migrate the duplicates, in bulk. My only option right now is to migrate EVERYTHING or else do it one by one.

All we need is a very simple system that allows us to select/deselect which cards we want to migrate.