Suppress display of generated files
Generated files, while sometimes needing review by humans, are generally ignored and assumed to be correct. However, their size can make them a challenge for a code reviewer, as they take up size (in terms of file limits for diff display) as well as taking up mental space for the reviewer.
One solution that users resort to is suppressing diffs via the `.gitattributes` file by setting something `binary` is a hack, but we could still make this experience better for manual suppression by detecting generated files and suppress inclusion of their content in the diff for an MR.
When suppressing diffs via `.gitattributes` it's not possible to actually load the diff if you do want to review the file. You're presented with a message like:

## Proposal
Detect and suppress auto-generated files from the diff. Update the UI to specify that the file was suppressed because of this condition, and provide a link to `load the diff anyway` which would then retrieve the correct diff and apply all the markup required to display it for the user.
## Unanswered Questions
- [ ] Should this be controlled by a project or group setting?
- [ ] Once a user clicks through and loads the diff of a generated file, is that diff then included in future page loads?
- [ ] If included, is it included for _all_ users, or just the user who manually loaded it into the diff?
- [ ] If excluded, is it loaded alongside the rest of the diff _for that user only_?
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