Fix Postgres password auth

For https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/1200

I deleted...

  postgresqlConfiguration: {"listen_addresses": "*"}
  pgHbaConfiguration: |-
    local all all md5
    host all all all md5

because they were not actually getting used. The way we have manipulated the postgres subchart to make use of IB images means that setting certain values does nothing. In this case these two values affect config files under bitnami directories, but the config files actually being used are in completely different locations.

In the future we may want to consider our own managed IB postgres chart that is fully functional, but that's out of scope for this quick fix for CI.