Move repo archiver to models/repo (#17913)

* Move repo archiver to models/repo

* Move archiver service into services/repository/

* Fix imports

* Fix test

* Fix test

models/repo/main_test.go

@@ -14,5 +14,6 @@ import (
 func TestMain(m *testing.M) {
 	unittest.MainTest(m, filepath.Join("..", ".."),
 		"attachment.yml",
+		"repo_archiver.yml",
 	)
 }