Drop get_formulas.py
    
    No longer useful since Salt no longer allows states to be installed
    outside the file root - and the /srv/formula directory populated by
    the script is not mountable as a file root itself given the states
    residing in subdirectories under the respective formula repository
    directories.
    The installation of Git based formulas in the test environment is
    taken care of by clone_formulas.sh now, which populates /srv/formulas
    with a checkout of salt-formulas-git.git, which in return was equipped
    with top level state directory symlinks.
    
    https://gitlab.infra.opensuse.org/infra/salt/-/issues/20
    https://bugzilla.opensuse.org/show_bug.cgi?id=1219985
    
    Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>