Retrieve package name from "emitter-output-dir" (#43093)

* Change package name retrieval to use emitter output dir

* Update python.py

Author: ChenxiJiang333

scripts/release_helper/python.py

@@ -147,7 +147,10 @@ def package_name_output_folder_from_tspconfig(self):
         emitters = yaml_contents.get("options", {})
         for emitter_name in emitters:
             if "/typespec-python" in emitter_name:
-                self.package_name = emitters[emitter_name].get("package-dir", "")
+                for dir in ["package-dir", "emitter-output-dir"]:
+                    self.package_name = emitters[emitter_name].get(dir, "").split("/")[-1]
+                    if self.package_name:
+                        break
                 break
 
     @property