Adds checkin action on asset delete via View UI

[snipe]

Previously, we would let you delete an asset that was checked out, and while we correctly logged the deletion, we didn't fire a checkin event.

[what-the-diff]

PR Summary

• Improvements to AssetsController.php (in both Api and Assets namespaces)

  • An enhancement has been made that triggers an event when an asset is deleted, but only if it was assigned to someone. Essentially, this event makes a note of who the asset was last with before it is removed from their name. This information could be helpful for record-keeping or auditing purposes.
  • The way the "destroy" function (which is responsible for deleting assets) works has been updated. Now it requires an additional piece of information (a "Request" parameter) to operate.

• Additions to general.php

  • A new text string 'checkin_and_delete' has been added to the system's language configurations. This new text represents an action where an asset is unassigned from a user before being deleted.

• Update in view.blade.php

  • The label on the delete button is now smarter. If the asset is assigned to someone, it will now display 'Checkin and Delete,' expressing the additional step needed before deletion. If the asset isn't assigned, it shows the usual 'Delete' label.