Revert filtering on repositories to be updated (#1412)

This reverts a part of #1383 so that repository updates are done in the pre-0.125.0 way, which tries to update any repositories only once regardless of they are referenced by selected releases or not.

Ref #1404

pkg/app/app_test.go

@@ -2490,6 +2490,7 @@ releases:
 
 	var wantRepos = []mockRepo{
 		{Name: "stable"},
+		{Name: "stable2"},
 	}
 
 	var buffer bytes.Buffer