Remove the (now) unused Config.package_args() method

This was used by the `mypy` `nox` session.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/repo/config/nox/config.py

@@ -147,44 +147,6 @@ def path_args(
 
         return list(str(p) for p in _util.existing_paths(paths))
 
-    def package_args(self, session: _nox.Session, /) -> list[str]:
-        """Return the package names to run the checks on.
-
-        If positional arguments are present in the nox session, those are used
-        as the file paths verbatim, and if not, all **existing** `source_paths`
-        are searched for python packges by looking for `__init__.py` files.
-        `extra_paths` are used as is, only converting the paths to python
-        package names (replacing `/` with `.` and removing the suffix `.pyi?`
-        if it exists.
-
-        Args:
-            session: The nox session to use to look for command-line arguments.
-
-        Returns:
-            The package names found in the `source_paths`.
-        """
-        if session.posargs:
-            return session.posargs
-
-        sources_package_dirs_with_roots = (
-            (p, _util.find_toplevel_package_dirs(p))
-            for p in _util.existing_paths(self.source_paths)
-        )
-
-        source_packages = (
-            _util.path_to_package(pkg_path, root=root)
-            for root, pkg_paths in sources_package_dirs_with_roots
-            for pkg_path in pkg_paths
-        )
-
-        extra_packages = (
-            _util.path_to_package(p) for p in _util.existing_paths(self.extra_paths)
-        )
-
-        return list(
-            _util.deduplicate(_itertools.chain(source_packages, extra_packages))
-        )
-
 
 _config: Config | None = None
 """The global configuration object."""