Add missing parameters to MergeRequestDiff struct

Alekhin Sergeyrequested to merge
a.sergey/client-go:mr-diff into main

The List merge request diffs API in GitLab 18.4 now includes new fields collapsed and too_large. See the merge request where these fields where added.

Should I mark these fields in any special way, considering they're only available starting from version 18.4?

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