tests: Set the rebuild=local/block=never meta in a simpler way

Thanks to @refi64 for making me discover that `osc branch` already had
this functionality built-in. D'oh.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

tests/test_packaging_pipelines.py

@@ -8,7 +8,6 @@ import re
 import subprocess
 import time
 import urllib.parse
-import xml.etree.ElementTree as ET
 
 import git
 import gitlab
@@ -292,19 +291,9 @@ class GitLabToOBSTester:
                 target_project=project,
                 msg=msg,
                 force=True,
+                add_repositories_block="never",
+                add_repositories_rebuild="local",
             )
-            meta_lines = osc.core.show_project_meta(self.apiurl, project)
-            meta_xml = ET.fromstringlist(meta_lines)
-            for repository in meta_xml.iter("repository"):
-                repository.set("rebuild", "local")
-                repository.set("block", "never")
-            meta_url = osc.core.make_meta_url(
-                "prj", path_args=project, apiurl=self.apiurl
-            )
-            meta = osc.core.metafile(
-                meta_url, ET.tostring(meta_xml, encoding="unicode")
-            )
-            meta.sync()
 
     def point_gitlab_ci_here(self, ci_config_path):
         logging.info(f"pointing to the CI definition at {ci_config_path}")