Remove QueryLimiting.whitelist for merge_requests#show

Igor Drozdovrequested to merge
id-remove-query-limiting-whitelist into master

What does this MR do?

A lot of ~performance optimizations have been implemented for this action within the latest 2 years. We can enable and see whether it raises any errors

Closes: #4793 (closed)

Edited by Igor Drozdov

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