Supported python version matrix for CI/CD

[GumpacG]

Summary

Run gremlin-python tests across all supported Python versions in parallel

Converts the single-version python job in build-test.yml into a fail-fast: false matrix covering Python 3.10-3.14, and
parameterizes gremlin-python/docker-compose.yml (image: python:${PYTHON_VERSION:-3.10}) so the matrix value actually reaches theinterpreter inside Docker. Default behavior for local mvn verify -pl gremlin-python is unchanged. Per-version JUnit reports areuploaded as artifacts.

Design

The python build-test for multiple versions are running in parallel and should take around the same time to complete (~25 min.) as before this change.

Follow up tasks

• This is a CI/CD change only and should be backported to 3.8-dev and 3.7-dev. Python 3.9 should be added to the matrix for 3.7-dev.
• Other GLVs should adopt this change as well for documented supported versions

TODO

There is an error from testing regarding asyncio.get_event_loop for Python 3.14 that is in progress.

Note

Assisted-by: Devin: Claude Opus 4.7

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.31%. Comparing base (cfd6889) to head (b65fb04).
⚠️ Report is 1036 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3420      +/-   ##
============================================
- Coverage     77.87%   76.31%   -1.56%     
+ Complexity    13578    13377     -201     
============================================
  Files          1015     1011       -4     
  Lines         59308    60147     +839     
  Branches       6835     7046     +211     
============================================
- Hits          46184    45902     -282     
- Misses        10817    11535     +718     
- Partials       2307     2710     +403     

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