feat: add Fedora 44 support alongside Fedora 43

- add fedora-44-mirrors ingredient and register it in the repository choices
- expand the desktop variant matrix to [43, 44, rawhide] (48 dishes)
- bump CI workflows and deploy fallback URL to Fedora 44
- cover both release repositories in tests

cook/tests/test_generator.py

@@ -99,6 +99,14 @@ def test_collect_fragments_gnome_standard(templates):
         assert slug in fragments
 
 
+@pytest.mark.parametrize("release", ["43", "44"])
+def test_collect_fragments_release_repository(templates, release):
+    variant = {"repository": release}
+    fragments, problems = gen.collect_fragments(templates, variant)
+    assert problems == []
+    assert f"repo/fedora-{release}-mirrors.ks" in fragments
+
+
 def test_collect_fragments_choices_default_to_first(templates):
     variant = {"repository": "43"}
     fragments, problems = gen.collect_fragments(templates, variant)