server-base is hampered by optional dependencies

[devinrsmith]

The server-base image specifies some optional dependencies that deephaven-core uses for testing; this has the effect of adding constraints to server-base that deephaven-core doesn't otherwise have. For example, turbodbc has constraints that limit the version of pyarrow that can be installed (and thus, limits the versions that deephaven-core can test).

Ideally, all of the "base" image logic (and potentially even these release images) could move into deephaven-core as part of, or after, deephaven/deephaven-core#3723.

[devinrsmith]

This is also limiting the ease of producing alternative images; for example, to get python 3.8 working, several changes need to be made to remove these optional dependencies (turbodbc does not have 3.8 support, adbc does not have 3.8 support, etc).