Fix fetching linked file for added and removed files
What does this MR do and why?
This MR fixes fetching added and removed linked files. Previously if you copied a link to an added or removed diff file you would get an error.
Screenshots or screen recordings
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How to set up and validate locally
- Open any merge request with added or removed text file
- Copy a link to a line in this file on the 'Changes' tab
- Open that link in a new tab
- Observe that linked file loads without any issues

