Replaces (and appropriately refactors) a number of endpoints that were removed long ago when we decided to kill the UI with the fleetctl release. We turned out not to do this, and now need to restore these missing endpoints.
This is not a straight up replacement of the existing code because of refactoring to the DB schemas that was also done in the migration.
Most of the replaced code was removed in #1670 and #1686.
Fixes#1811, fixes#1810
With the UI, deleting by ID made sense. With fleetctl, we now want to delete
by name. Transition only the methods used for spec related entities, as others
will be removed soon.
with an exposed interface.
Not checking for a specific sentinel error reduces coupling between packages
and allows adding context like the resource ID and resource type.
