Remove `ci_owned_runners_unnest_index` feature flag
What does this MR do and why?
Based on: !88529 (merged)
This feature is fully rolled out in production as part of #357869 (closed).
Closes: #357869 (closed)
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.
Edited by Kamil Trzciński (Back 2025-01-01)