Allow access to all diffs via API above diff limits
Problem to Solve
There are usecases (like #22329 (closed)) which would require large diffs to be rendered in the application or via third part integrations. However, the API currently does not allow diffs/changes to be retrieved and is capped at the instance defined limits.
Proposal
Create an instance level override option on a per file-type basis that gives more granular control to return larger diff files for certain use cases.
Additional Details
Additional thoughts on this available in #300385 (comment 499928541)