Consider progress info for deposit

[amyehodge]

One of the testers asked if there was any way to get a progress bar for when you click on the deposit button, especially considering this could take quite a while. Instead of just having the "Depositing..." message.

We need to assess what kind of accessibility issues there might be with something like this.

[amyehodge]

From @andrewjbtw If it’s progress of the deposit, wouldn’t that mean tracking through the workflows? Progress is tricky in that sometimes “number of steps remaining” and “amount of time remaining” can be far apart, and amount of time is a guess. The file copy/checksum check steps on larger deposits are probably 90-99% of the time.