gen-depsolve-dnf4: adjust mockdata() for new exclude: prefix

This commit follows osbuild/images#938
and adjust the way excludes are represented.

src/otk_external_osbuild/command/gen_depsolve_dnf4.py

@@ -34,15 +34,15 @@ def mockdata(packages):
             "release": "0",
             "arch": "noarch",
         }
-        for p in packages
+        for p in packages["include"] + [f"exclude:{p}" for p in packages["exclude"]]
     ]
 
 
 def root(input_stream: TextIO) -> None:
     data = json.loads(input_stream.read())
     tree = data["tree"]
     if "OTK_UNDER_TEST" in os.environ:
-        packages = mockdata(tree["packages"]["include"])
+        packages = mockdata(tree["packages"])
         sys.stdout.write(json.dumps(transform(packages)))
         return