graalvmXX-ce: add sourcesPath parameter

In #168816, we removed support for Python/Ruby/WASM to reduce the
support burden of GraalVM languages that, arguably, are not really being
used.

However, the way that `pkgs.graalvmCEPackages.mkGraal` function works
right now doesn't allow passing a custom sources file, that would allow
someone to compile GraalVM with the additional products (e.g.: Python).
This PR adds this possibility.

So if someone wants to create a custom graalvm11-ce derivation with
Python support, for example, they can do something like this:

```nix
let
   graalvm11-ce-custom = pkgs.graalvmCEPackages.mkGraal {
      config = {
         x86_64-linux = {
            products = [ "graalvm-ce" "python-installable-svm" ];
            arch = "linux-amd64";
         };
      };
      defaultVersion = "22.0.0.2";
      javaVersion = "11";
      platforms = "x86_64-linux";
      sourcesPath = /home/someone/graalvm11-ce-sources.json;
   };
in
{
   environment.systemPackages = [ graalvm11-ce-custom ];
}
```

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