[Merged by Bors] - feat(Algebra/Homology): morphisms from the homotopy cofiber#9447
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[Merged by Bors] - feat(Algebra/Homology): morphisms from the homotopy cofiber#9447
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In this PR, we obtain `HomologicalComplex.homotopyCofiber.descEquiv` which expresses that if `φ : F ⟶ G` is a morphism of homological complexes, then a morphism `homotopyCofiber φ ⟶ K` is uniquely determined by a morphism `α : G ⟶ K` and a homotopy from `φ ≫ α` to `0`.
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In this PR, we obtain
HomologicalComplex.homotopyCofiber.descEquivwhich expresses that ifφ : F ⟶ Gis a morphism of homological complexes, then a morphismhomotopyCofiber φ ⟶ Kis uniquely determined by a morphismα : G ⟶ Kand a homotopy fromφ ≫ αto0.