pipeline: always invoke monitor.finish

Also invoke `monitor.finish` when the pipeline failed to built.
There is no need to not invoke it in that case. This also will
allow us to print some information in the monitor in tha case.

osbuild/pipeline.py

@@ -348,10 +348,10 @@ class Pipeline:
 
         monitor.begin(self)
 
-        results = self.build_stages(store, monitor, libdir, stage_timeout)
-
-        if not results["success"]:
-            return results
+        results = self.build_stages(store,
+                                    monitor,
+                                    libdir,
+                                    stage_timeout)
 
         monitor.finish(results)