The former is a profile to install postgresql development packages. The later
is to actually install pg_service/pg_pass files per use to allow connections
with cli like psql service=swh.
This also stops too many postgresql tools installation. Currently, the staging
nodes installs the postgresql-13 packages where it should not. The server part
for those nodes currently pins the version it wants and that's not respected
due to that profile.
This is a pre-requisite clean up step for T2736.