[Merged by Bors] - chore(topology/algebra/group): move a lemma to group_theory/coset
#4522
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quotient_group_saturate
didn't use any topology. Move it togroup_theory/coset
and rename toquotient_group.preimage_image_coe
.Also rename
quotient_group.open_coe
toquotient_group.is_open_map_coe
quot.mk
etc are surjective #4517quot.mk
etc are surjective