pythonPackages.accupy: remove perfplot from checkInputs
pythonPackages.accupy: remove perfplot from checkInputs

they were only used for performance tests that aren't useful to us -
disabling these tests allows us to decouple from an unnecessary build
dependency.

convert to pytestCheckHook.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs