Revert "dulwich: workaround for codespaces system config"

This reverts commit 8b40388.

src/scmrepo/git/backend/dulwich/__init__.py

@@ -285,32 +285,10 @@ def commit(self, msg: str, no_verify: bool = False):
             try:
                 commit(self.root_dir, message=msg, no_verify=no_verify)
             except InvalidUserIdentity as exc:
-                identity = self._get_codespaces_identity()
-                if identity is not None:
-                    commit(
-                        self.root_dir,
-                        message=msg,
-                        no_verify=no_verify,
-                        committer=identity,
-                        author=identity,
-                    )
-                else:
-                    raise SCMError("Git username and email must be configured") from exc
+                raise SCMError("Git username and email must be configured") from exc
             except TimezoneFormatError as exc:
                 raise SCMError("Invalid Git timestamp") from exc
 
-    def _get_codespaces_identity(self) -> Optional[bytes]:
-        from dulwich.config import ConfigFile, StackedConfig
-        from dulwich.repo import get_user_identity
-
-        if "CODESPACES" not in os.environ:
-            return None
-        try:
-            config = StackedConfig([ConfigFile.from_path("/usr/local/etc/gitconfig")])
-            return get_user_identity(config)
-        except Exception:  # pylint: disable=broad-except
-            return None
-
     def checkout(
         self,
         branch: str,