update vlass templates for pimscache python3.10 upgrade

Let's make sure pimscache can actually find python3.10 from a workflow...

shared/workspaces/alembic/versions/templates/pims_split/split_sh_2.8.3.txt

 #!/bin/sh
 export HOME=$TMPDIR
+export PATH=$PATH:/home/ssa/bin
+
 TILE=$(echo $1 | cut -d "/" -f 1)
 PHCENTER=$(echo $1 | cut -d "/" -f 2)
 STAGE=$1