[Bug] `requirements-dev.txt` misses dependencies needed for local Python tests

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Paimon version

paimon-python/dev/requirements-dev.txt is currently incomplete for local Python development. For example, basic test dependencies such as pytest are not fully represented there, so developers cannot rely on this file to set up a local environment for running Python tests.

As a result, local setup has to be inferred from the GitHub CI workflow, where many dependencies are installed manually in .github/workflows/paimon-python-checks.yml. This makes local development error-prone and easy to drift from CI.

Compute Engine

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Minimal reproduce step

• Create a clean virtualenv
• Running pip install -r dev/requirements-dev.txt
• Running pytest, a lot of dependencies are missing, including pytest itself

What doesn't meet your expectations?

requirements-dev.txt should include the common dependencies needed for local Python test development. After that, CI can reuse this file for the common setup, while keeping feature-specific dependencies installed separately when needed.

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!