Add exception as parameter to the missing() callbacks (#38289)

* Add ModelNotFoundException as input to missing closure

Add  `ModelNotFoundException` exception to the missing callback and only return the result of the callback if this is not present.

* Rename variable to $callbackResponse

* StyleCI fix

* Update SubstituteBindings.php

Co-authored-by: Taylor Otwell <taylor@laravel.com>

src/Illuminate/Routing/Middleware/SubstituteBindings.php

@@ -41,7 +41,7 @@ public function handle($request, Closure $next)
             $this->router->substituteImplicitBindings($route);
         } catch (ModelNotFoundException $exception) {
             if ($route->getMissing()) {
-                return $route->getMissing()($request);
+                return $route->getMissing()($request, $exception);
             }
 
             throw $exception;