gopls: build modernize and gofix binaries (#388985)

  doCheck = false;

  # Only build gopls, and not the integration tests or documentation generator.

  subPackages = [ "." ];

  # Only build gopls, gofix, modernize, and not the integration tests or documentation generator.

  subPackages = [

    "."

    "internal/analysis/gofix/cmd/gofix"

    "internal/analysis/modernize/cmd/modernize"

  ];

  meta = with lib; {

    description = "Official language server for the Go language";