Remove `ci_owned_runners_cross_joins_fix` feature flag
What does this MR do and why?
Based on: !88526 (merged)
This feature is fully rolled out in production as part of #350322 (closed).
The #350322 (closed) is closed and feature fully rolled out this removes feature flag.
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