feat: allow developers to delete unofficial achievements

[wescopeland]

This PR grants developers the ability to delete unofficial achievements in the management app. An achievement may be soft-deleted if:

• The achievement is sitting in unofficial.
• The achievement has 0 unlocks.

This should eliminate the need to have "[void]" achievements, or to attach achievements to things like hub games.

Brave.Browser.mp4

Developers also have the ability to restore soft-deleted achievements:

Deletes and restores are recorded on the achievement's audit log:

Additionally, I've verified that soft deleted achievements no longer appear in RALibretro's assets list:

[Jamiras]

Obviously not part of this PR, but restoring a deleted record adds audit information showing all the fields even though they technically weren't modified.

[Jamiras]

Also, unrelated to this PR, searching for achievement IDs seems to be matching the badge name:

mysql> select BadgeName from Achievements where ID=176447;
+-----------+
| BadgeName |
+-----------+
| 196740    |
+-----------+