Load 10mb of a diff instead of 100kb

Igor Drozdovrequested to merge
id-fix-viewing-diff-of-a-large-blob into master

What does this MR do?

It reverts the change responsible for this bug: #199210 (closed).

The change has been introduced !24160 (merged), so 100kb instead of 10mb for a blob was loaded. It doesn't consider the edge case when we have a small change to a large blob file: in this case, we still need to display the diff

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