gh-124771: Add the `PYTHON_GC_PRESET` env var.#124772

Draft

nascheme wants to merge 2 commits intopython:mainfrom

nascheme:gc_strategy

Commits on Sep 29, 2024

gh-124771: Add the `PYTHON_GC_STRAGEGY` env var.
nascheme
committed

Commits on Oct 1, 2024

Rename option and values, based on discussion.
nascheme
committed