Handle long disk names in instance create disks table

[david-crespo]

I added disk type to the table on instance create, which works fine IMO:

Except we have a width problem with long disk names:

Prior to this change we deal with this by eliding the long name with an ellipse, though even then we seem to have made our truncate length a little too long:

With the extra column there, I have to go all the way down to truncating at 16 to get it to look right. I'm honestly not sure whether this is tolerable or not. Certainly it would be unwieldy to work with a few disks whose names have a long common prefix.

Originally posted by @david-crespo in #2984 (comment)

[linear]

PRD-244