Clicking a filename in a MR comment reloads the page

Follow-up iteration of gitlab-ce#50185

Summary

When viewing a comment on a diff in an MR, clicking on the file name navigates to the changes tab and causes a page reload. The page reload could be prevented by using merge_request_tabs.js which will essentially use AJAX to load the tab.

Discussion about this can be found here: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22109#note_107302866

Steps to reproduce

Open an MR with comments on a diff and click on the filename.

Example Project

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21110

What is the current bug behaviour?

Page reloads instead of switching to changes without reloading the page

What is the expected correct behaviour?

Clicking the filename should change to the changes tab without reloading the page