feat(algebra/group_power/lemmas): remove commutativity requirement from is_unit_pos_pow_iff
#10041
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…om `is_unit_pos_pow_iff` Also adds a simp lemma, is_unit_pow_succ_iff
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Also adds
is_unit_mul_self_iffand a simp lemma,is_unit_pow_succ_iff. This is a follow-up to #8420.is_unit_pos_pow_iff#10041