Delete a Share [Manila] [Stage 1]

Problem/Opportunity Statement

(Related to #445 (comment 1271210676) 1st stage implementation.)

Delete an existing Share from a project in Exosphere.

What would success / a fix look like?

• Add a Delete button to the Shares list.
• Add a Delete button to the Share Detail page.
• Confirm that deleting a Share might impact other users.
• Delete the Share.