ci/eval/compare: remove package validity check

This should not be necessary anymore, because packages that fail to
evaluate should already be filtered out by the attrpath generation step
in main eval.

(cherry picked from commit 0753aa4580)

ci/eval/compare/maintainers.nix

@@ -27,25 +27,9 @@ let
     name = name;
   }) (changedattrs ++ removedattrs);
 
-  validPackageAttributes = builtins.filter (
-    pkg:
-    if (lib.attrsets.hasAttrByPath pkg.path pkgs) then
-      (
-        let
-          value = lib.attrsets.attrByPath pkg.path null pkgs;
-        in
-        if (builtins.tryEval value).success then
-          if value != null then true else builtins.trace "${pkg.name} exists but is null" false
-        else
-          builtins.trace "Failed to access ${pkg.name} even though it exists" false
-      )
-    else
-      builtins.trace "Failed to locate ${pkg.name}." false
-  ) enrichedAttrs;
-
   attrsWithPackages = builtins.map (
     pkg: pkg // { package = lib.attrsets.attrByPath pkg.path null pkgs; }
-  ) validPackageAttributes;
+  ) enrichedAttrs;
 
   attrsWithMaintainers = builtins.map (
     pkg: