Make bash script executable for htcondor

[Mael-Le-Garrec]

Some instances of htcondor need an executable flag for the bash script, like the one used by the CNRS IN2P3.

Code to be added around there:

submitter/pylhc_submitter/submitter/htc_utils.py

Lines 237 to 239 in ac89efe

	f.write(f'{cp_command}\n')
	shell_scripts[idx] = bash_file_name

This fixes it, probably needs a check for windows as well

status = _start_subprocess(["chmod", "+x", f"{jobfile}"])