use os.system to implement dm.remove_files

from .dfs import gaia_query_from_dfs, get_l1api

from .params import CSST_PARAMS as CP

from .params import DFS_CONF

from .utils import remove_files, remove_dir

from .utils import remove_dir

class CsstMsDataManager:

        lines += f"CSST_DFS_GATEWAY = " + os.getenv("CSST_DFS_GATEWAY") + "\n"

        return lines

    @staticmethod

    def remove_files(fmt="./*_post.fits"):

        remove_files(fmt=fmt)

    def remove_files(self, fmt="*.fits"):

        os.system(f"rm -rf {os.path.join(self.dir_l1, fmt)}")

    @staticmethod

    def remove_dir(path):