Implements the form for renaming the new filename on the file edit page

What does this MR do?

Adds the possibility to edit a filename when editing the content of a file on Gitlab

this MR was made to solve #5850 (closed)

app/controllers/concerns/creates_commit.rb

@@ -7,7 +7,8 @@ module CreatesCommit
     commit_params = @commit_params.merge(
       source_project: @project,
       source_branch: @ref,
-      target_branch: @target_branch
+      target_branch: @target_branch,
+      file_path: @path
     )
     result = service.new(@tree_edit_project, current_user, commit_params).execute