Symlink binaries of latest available bundled PG version if users are using an external PG
Related to #5299 (closed). In an external PG scenario, the
pg_dump version being used by DB migrations as part of reconfigure may be of a lower version of PG than the external one. This can cause reconfigure to fail.
Proposal: If bundled PG is disabled, symlink the latest available version of PG binaries. Newer binaries can talk with older PG versions without any issues, so this should be safe.