[Merged by Bors] - feat: forward-port PR 19070#4327
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Forward-port leanprover-community/mathlib3#19070: - add `Filter.set_eventuallyLE_iff_mem_inf_principal`, `Filter.set_eventuallyLE_iff_inf_principal_le`, and `Filter.set_eventuallyEq_iff_inf_principal`; - golf `nhdsWithin_eq_iff_eventuallyEq` and `nhdsWithin_le_iff`. The original PR golfs one more lemma which was already golfed to 1 line in Mathlib 4.
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Forward-port leanprover-community/mathlib3#19070: - add `Filter.set_eventuallyLE_iff_mem_inf_principal`, `Filter.set_eventuallyLE_iff_inf_principal_le`, and `Filter.set_eventuallyEq_iff_inf_principal`; - golf `nhdsWithin_eq_iff_eventuallyEq` and `nhdsWithin_le_iff`. The original PR golfs one more lemma which was already golfed to 1 line in Mathlib 4.
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Forward-port leanprover-community/mathlib3#19070:
Filter.set_eventuallyLE_iff_mem_inf_principal,Filter.set_eventuallyLE_iff_inf_principal_le, andFilter.set_eventuallyEq_iff_inf_principal;nhdsWithin_eq_iff_eventuallyEqandnhdsWithin_le_iff.The original PR golfs one more lemma which was already golfed to 1
line in Mathlib 4.