In MR, View file @ should use branch rather than SHA
## Description
- Update the `View. @` button in the file view of the mr diff to be just a `View` button that links to the file at the branch (and not at the commit).
- Remove the `Edit` button from the file view.
## Original descripton
I'm not positive of the implications of this, but I've often found myself looking at an MR, then clicking on `View file @ somesha`, then wanting to edit the file to be told . Perhaps the button to view the file should go to the branch ref instead of the SHA? Going to a specific SHA is more valuable if I'm looking at historic changes, not current changes.
issue