pythonPackages.pathpy: skip performance test

[timokau]

Motivation for this change

The test may fail non-deterministically, as it does right now on hydra.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

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[timokau]

@GrahamcOfBorg build python2.pkgs.pathpy python3.pkgs.pathpy

[timokau]

Oh just noticed the rebuild count. I think with 101-500 and most of them probably light python packages, I should be able to get away without staging.

[timokau]

Oh and all of those packages probably failed on the most recent build, so that should be worth it.