DM-55061: Calculate default value of dbauth_alias

[andy-slac]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.90%. Comparing base (8573ff4) to head (91b6224).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
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+ Coverage   84.83%   84.90%   +0.07%     
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  Files          73       73              
  Lines        7385     7408      +23     
  Branches      847      850       +3     
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+ Hits         6265     6290      +25     
+ Misses        883      881       -2     
  Partials      237      237              

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[Copilot]

Pull request overview

Adds support for deriving a default dbauth_alias for Cassandra db-auth credential lookup when the alias is not explicitly configured, enabling automatic selection of prod/dev credential entries based on username and keyspace.

Changes:

• Added ApdbCassandraConfig.get_dbauth_alias() to compute a default alias when connection_config.dbauth_alias is empty.
• Updated SessionFactory._make_auth_provider() to use the computed alias (when available) with higher priority than contact points.
• Extended Cassandra db-auth tests to cover the new derived-alias behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tests/test_apdbCassandra.py	Adds db-auth fixtures and assertions to validate derived alias lookup behavior.
python/lsst/dax/apdb/cassandra/sessionFactory.py	Switches db-auth host selection to use computed alias via config helper.
python/lsst/dax/apdb/cassandra/config.py	Introduces get_dbauth_alias() and updates dbauth_alias field description to document defaulting behavior.

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