chore: merge provisioner key and provisioner permissions (#16628)

Provisioner key permissions were never any different than provisioners.
Merging them for a cleaner permission story until they are required (if
ever) to be seperate.

This removed `ResourceProvisionerKey` from RBAC and just uses the
existing `ResourceProvisioner`.

coderd/database/modelmethods.go

@@ -277,8 +277,10 @@ func (p GetEligibleProvisionerDaemonsByProvisionerJobIDsRow) RBACObject() rbac.O
 	return p.ProvisionerDaemon.RBACObject()
 }
 
+// RBACObject for a provisioner key is the same as a provisioner daemon.
+// Keys == provisioners from a RBAC perspective.
 func (p ProvisionerKey) RBACObject() rbac.Object {
-	return rbac.ResourceProvisionerKeys.
+	return rbac.ResourceProvisionerDaemon.
 		WithID(p.ID).
 		InOrg(p.OrganizationID)
 }