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[CUDA] Add Poisson regression objective for cuda_exp and refactor objective functions for cuda_exp (#5486)

* add poisson regression objective for cuda_exp

* enable Poisson regression for cuda_exp

* refactor cuda objective functions

* remove useless changes

* fix linter errors

* remove redundant buffer in cuda poisson regression objective

* fix log of cuda_exp binary objective

* fix threshold of poisson objective result

* remove useless changes

* fix compilation errors

* add cuda quantile regression objective

* remove cuda quantile regression objective
Co-authored-by: James Lamb <jaylamb20@gmail.com>

[docs] Improve docs: fix consistency of dots in C API and add notes about new ``time-costs`` Python-package build option (#5554)

* Auto-update configure
Co-authored-by: GitHub Actions Bot <githubactionsbot@users.noreply.github.com>

[ci] prefer CPython in Windows test environment and use safer approach for cleaning up network (fixes #5509) (#5510)