test-infinitepush: drop unused helper
They are unused since de4c2f3af97f. We drop them for clarity.
Differential Revision: https://phab.mercurial-scm.org/D11048
run-tests: setup "correct" python earlier
I don't see any good reason to wait. This result in slightly simpler code.
Differential Revision: https://phab.mercurial-scm.org/D11047
run-tests: cleanup windows generation of the python / python3 pointeur
They are no need to generate then in RUNTESTDIR and we don't need a python2
executable. (because not test ever use `python2` explicitly).
This is probably still not perfect, but at least it is better.
Differential Revision: https://phab.mercurial-scm.org/D11045