Fix OpenPBSDriver.kill() getting malformed input

This commit fixes the issue where we get `qdel: illegally formed job identifier: 'job_1 job_2'` when killing jobs. This is fixed by not joining the list of job ids into a single argument

Author: jonathan-eq

src/ert/scheduler/openpbs_driver.py

@@ -252,7 +252,7 @@ async def kill(self, realizations: Iterable[int]) -> None:
             return
 
         process_success, process_message = await self._execute_with_retry(
-            [str(self._qdel_cmd), " ".join(job_ids_to_kill)],
+            [str(self._qdel_cmd), *job_ids_to_kill],
             retry_codes=(QDEL_REQUEST_INVALID,),
             accept_codes=(QDEL_JOB_HAS_FINISHED,),
             total_attempts=self._max_pbs_cmd_attempts,