stdenv/check-meta: change to allowlist and blocklist

[worldofpeace]

Motivation for this change

It felt significant to make this rename...
I haven't thought of the way to make it throw with instructions to change to the new attr, and I still need to make documentation for it. For now it will be a draft until I get back to it. But if anyone wants to finish that go ahead.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• 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 nixpkgs-review --run "nixpkgs-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)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[grahamc]

This looks good. One way we could merge it right away is by falling back to the old names if the new names are not present. It would not throw / warn, but it would get us a step further.

[worldofpeace]

I can make a release note later. Will also do nixos option renames.

[mohe2015]

Too late but why not allowedLicenses and forbiddenLicenses?