Set FF `ci_remove_legacy_predefined_variables` to default ON
What does this MR do and why?
This sets the feature flag ci_remove_legacy_predefined_variables
to default ON. This FF is currently being rolled out in #404533 (closed) and is expected to be fully rolled out by the end of this week.
Since we require code changes to be merged in by the 11th, I am creating this MR now to ensure it is included in the %16.0 release.
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.
Related to #404533 (closed)
Edited by Leaminn Ma