Fix ErrorTracking reference from controller

Dmytro Zaporozhets (DZ)requested to merge
dz-fix-error-tracking-contoller-namespace-reference into master

What does this MR do?

Adds :: to ErrorTracking namespace in app/controllers/projects/error_tracking_controller.rb

Does this MR meet the acceptance criteria?

Yes

Edited by Dmytro Zaporozhets (DZ)

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