Update REST and CI docker compose scripts to sync with 7.x backend

[tdonohue]

Manual port of #2966 to dspace-7_x.

This fixes an error that also occurs if you attempt to run the backend using the guide at https://wiki.lyrasis.org/display/DSPACE/Try+out+DSpace+7 When doing so, the dspacedb container will fail to start with this error:

Error: Database is uninitialized and superuser password is not specified.
        You must specify POSTGRES_PASSWORD to a non-empty value for the
        superuser. For example, "-e POSTGRES_PASSWORD=password" on "docker run".

[tdonohue]

This PR is failing e2e tests because of minor bugs in Backend Dockers Scripts. These bugs are fixed in DSpace/DSpace#9491

[tdonohue]

Backend fixes were applied in DSpace/DSpace#9491 and all Angular tests now pass. Merging immediately.