[Merged by Bors] - chore(data/finset): golf some proofs #6101
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Golf some proofs about `finset.min'` and `finset.max'` by reusing properties of `is_lub`/`is_glb`.
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* prove that `finset.min'` and `finset.max'` are `is_least` and `is_greatest` elements of the corresponding sets; * use this fact to golf some proofs; generalize `min'_lt_max'` to `is_glb_lt_is_lub_of_ne`; * add `finset.card_le_one` and `finset.one_lt_card`. Co-authored-by: Yury G. Kudryashov <urkud@urkud.name>
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* prove that `finset.min'` and `finset.max'` are `is_least` and `is_greatest` elements of the corresponding sets; * use this fact to golf some proofs; generalize `min'_lt_max'` to `is_glb_lt_is_lub_of_ne`; * add `finset.card_le_one` and `finset.one_lt_card`. Co-authored-by: Yury G. Kudryashov <urkud@urkud.name>
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finset.min'andfinset.max'areis_leastandis_greatestelements of the corresponding sets;generalize
min'_lt_max'tois_glb_lt_is_lub_of_ne;finset.card_le_oneandfinset.one_lt_card.