E2E: Remove ff toggle from large gitlab migration test
What does this MR do and why?
Describe in detail what your merge request does and why.
The environment test runs on has this feature toggle enabled.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.