feat(cicd): centralize pytest config

[BobTheBuidler]

Summary

• move pytest CLI args into config files
• keep workflows invoking pytest without inline args

Manual testing

• not run (not requested)

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Fix testpaths so CodSpeed collects benchmarks

Because the workflow now runs pytest with -c benchmarks/pytest-codspeed.ini, pytest sets its rootdir to the directory containing that config. With testpaths = benchmarks here, collection resolves to benchmarks/benchmarks, which does not exist in this repo, so CodSpeed will collect zero tests and the benchmark run silently does nothing. To ensure benchmarks run, make testpaths relative to the config directory (e.g., .) or drop testpaths and pass the path explicitly.

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