Feature request: --no-split flag to disable splitting regardless of config

Hi,

I’d like to request a new CLI flag for pytest-split similar to how pytest-cov implements --no-cov.

Sometimes it’s useful to temporarily run the full test suite without splitting, even if pytest-split is configured in pytest.ini or other configuration files.

Thanks for consideration.

Start by locating pytest-split's CLI option registration and the handling of settings from pytest.ini or other configuration files. Compare the requested behavior with pytest-cov's --no-cov option, then verify that --no-split runs the full test suite even when splitting is configured.

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