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

Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

Co-authored-by: James Lamb <jaylamb20@gmail.com>

* [docs] update and simplify installation docs

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* remove more references to CMake and GLIBC versions

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Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

fix documentation for quantized training

[python-package] remove uses of deprecated NumPy random number generation APIs, require 'numpy>=1.17.0' (#6468)

* [python-package] Allow to pass early stopping min delta in params

* Fix test

* Add separate test

* Fix

* Add to cpp config

* Adjust test

* Adjust test

* Debug

* Revert

* Apply suggestions from code review

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Co-authored-by: James Lamb <jaylamb20@gmail.com>