Linked file can not be fetched for an outdated MR verison

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Example link.

How to reproduce

1. Create a merge request
2. Go to the Changes tab and copy a link to a random line
3. Rebase MR branch against a newer target branch
4. Force push the changes
5. Try to open the copied link
6. The linked file is not fetched because the latest version doesn't contain the linked file hash

Potential fix

We could always specify MR version when providing a linked file query. Alternative: always provide a trimmed commit hash together with the file hash (will increase link length by at least 11 symbols).