api: status: return gc-status again

Returning the GC status was dropped by mistake in commit 762f7d15
("datastore status: factor out api type DataStoreStatusListItem")

As this is considered a breaking change which we also felt, due to
the gc-status being used in the web interface for the datastore
overview list (not the dashboard), re add it.

Fixes: 762f7d15
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
 [ T: add reference to breaking commit, reword message ]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/api2/status.rs

@@ -63,6 +63,7 @@ pub fn datastore_status(
                     history_delta: None,
                     estimated_full_date: None,
                     error: Some(err.to_string()),
+                    gc_status: None,
                 });
                 continue;
             }
@@ -79,6 +80,7 @@ pub fn datastore_status(
             history_delta: None,
             estimated_full_date: None,
             error: None,
+            gc_status: Some(datastore.last_gc_status()),
         };
 
         let rrd_dir = format!("datastore/{}", store);