Add units for request_memory in DAG layers
There is a proposal for IGWN grid resources to require units for request_disk
and request_memory
in the near future, see https://git.ligo.org/computing/sccb/-/issues/1442.
The DAGs generated here don't currently specify units for request_memory
which will be an issue for online and offline analyses, example:
https://git.ligo.org/lscsoft/gstlal/-/blob/master/gstlal/python/dags/layers/psd.py#L30
This can be changed from 2000
to 2000 MB
or 2 GB
.