perf(DoldKan/EquivalencePseudoabelian): use suppress_compilation (#13858)

Compiling the file takes 14s; the computability is not used anywhere in mathlib.
Speeds up the file by 78%.

Author: grunweg

Mathlib/AlgebraicTopology/DoldKan/EquivalencePseudoabelian.lean

@@ -6,6 +6,7 @@ Authors: Joël Riou
 import Mathlib.AlgebraicTopology.DoldKan.EquivalenceAdditive
 import Mathlib.AlgebraicTopology.DoldKan.Compatibility
 import Mathlib.CategoryTheory.Idempotents.SimplicialObject
+import Mathlib.Tactic.SuppressCompilation
 
 #align_import algebraic_topology.dold_kan.equivalence_pseudoabelian from "leanprover-community/mathlib"@"32a7e535287f9c73f2e4d2aef306a39190f0b504"
 
@@ -35,6 +36,7 @@ the composition of `N₁ : SimplicialObject C ⥤ Karoubi (ChainComplex C ℕ)`
 -/
 
 
+suppress_compilation
 noncomputable section
 
 open CategoryTheory CategoryTheory.Category CategoryTheory.Limits CategoryTheory.Idempotents