cypress: Remove test

[roberth]

Description of changes

We used to have a test for cypress, but I'm removing it as

• it broke, and ofborg didn't fail PR check doesn't fail even if all passthru.tests fail ofborg#629
• it had a large footprint in the repo; prefer RFC 92 or an ugly FOD fetcher?
• I've switched away from cypress.

cc cypress maintainers @thorstenweber83 @mmahut @Craftzman7

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 23.05 Release Notes (or backporting 22.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[Craftzman7]

After reading through your reasons for changing this, I agree completely. This has the green light from me.