Ability to delete keys in buckets via the GUI

__Proposal:__
Ability to delete keys with associated data from buckets

__Current behavior:__
When I have buckets with keys that have data that is no longer relevant I have no easy way to delete it from the GUI

__Desired behavior:__
Ability to delete keys with associated data from buckets

__Alternatives considered:__
None

__Use case:__
It will make life easier since I won't need to use the CLI to delete data and it'd save a lot of time

No files, tests, or entry points are named. Start by locating the GUI code for bucket contents and key management, then trace how deletion is handled through the data layer. Done means users can delete a key and its associated data from a bucket in the GUI, with the existing behavior covered by appropriate tests.

Written by the indexing model from the issue text.