Update UnitDao to retrieve info in one call and resolve a bug that Peter identified

In reference to #498, a bug was identified in Peter's review of other parts of the code, and found that the query needs to be adjusted to do one call and correctly provide the base unit, and its aliases. The view picks up the aliases, so it was returning a series of duplicate entries for different aliases.

          select cu.unit_id, cu.long_name, cu.unit_system, cu.description, cap.abstract_param_id, atu.alias_id

from cwms_20.cwms_unit cu
inner join cwms_20.at_unit_alias atu on (cu.unit_code = atu.unit_code and (db_office_code = 53 /or db_office_code = SWT/))
inner join cwms_20.cwms_abstract_parameter cap on (cu.abstract_param_code = cap.abstract_param_code)

Originally posted by @rma-psmorris in https://github.com/USACE/cwms-data-api/pull/718#discussion_r1687230205

Locate UnitDao and inspect the query and the view that consumes its aliases. Review the context in #498 and the linked PR #718 discussion, then verify that one retrieval provides the base unit and aliases without duplicate entries.