api: status: rely on get_formats() method for determining format-related info

Rely on get_formats() rather than just the static plugin data in the
'status' API call. This removes the need for the special casing for
LVM storages without the 'snapshot-as-volume-chain' option. It also
fixes the issue that the 'format' storage configuration option to
override the default format was previously ignored there.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>

src/PVE/API2/Storage/Status.pm

@@ -220,12 +220,6 @@ __PACKAGE__->register_method({
                 $data->{used_fraction} = ($data->{used} // 0) / $data->{total};
             }
 
-            # TODO: add support to the storage plugin system to allow returing different supported
-            # formats depending on the storage config instead, this is just a stop gap!
-            if (lc($data->{type}) eq 'lvm') {
-                $data->{format}->[0]->{qcow2} = 0 if !$scfg->{'snapshot-as-volume-chain'};
-            }
-
             $res->{$storeid} = $data;
         }