Merge branch 'tc-fix-296939' into 'master'

Ensure MergeRequestsFinder uses correct Params

See merge request gitlab-org/gitlab!51195

app/finders/merge_requests_finder.rb

@@ -57,7 +57,7 @@ class MergeRequestsFinder < IssuableFinder
   end
 
   def params_class
-    MergeRequestsFinder::Params
+    MergeRequestsFinder.const_get(:Params, false) # rubocop: disable CodeReuse/Finder
   end
 
   def filter_items(_items)