[3.14] gh-123471: Free-threading fixes for itertools (GH-131212) (GH-132814) (GH-135689) (GH-144402) (GH-146033) (GH-142957)

[3.14] gh-123471: Free-threading fixes for itertools (GH-131212) (GH-132814) (GH-135689) (GH-144402) (GH-146033) (GH-142957) #278913