fix(magit): gate code-review behind +forge

code-review requires forge, therefore it shouldn't be available if
+forge isn't enabled on the :tools magit module.

Ref: 2d3a68df49
Fix: #5935

modules/tools/magit/config.el

@@ -189,6 +189,7 @@ ensure it is built when we actually use Forge."
 
 
 (use-package! code-review
+  :when (featurep! +forge)
   :after magit
   :init
   ;; TODO This needs to either a) be cleaned up or better b) better map things