E2E: Fix large gitlab import spec

andreyrequested to merge
andrey-fix-large-import-spec into master

What does this MR do and why?

Skip trying to enable gitlab import instance setting for large import spec which uses production as source and doesn't have admin user available

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by andrey

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