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* [ci] combine pip installs in Python test scripts

* remove most CI

* Revert "remove most CI"

This reverts commit 8c0c1ec7b6e4e9f69190965abbf58b760efc8c6d.

[python-package] require `scikit-learn>=0.24.2`, make scikit-learn estimators compatible with `scikit-learn>=1.6.0dev` (#6651)
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

[ci] [python-package] temporarily stop testing against scikit-learn nightlies, load lib_lightgbm earlier (#6654)

[python-package] Add support for NumPy 2.0, test against nightly versions of dependencies (fixes #6454) (#6467)