Remove `ci_job_jwt` feature flag
What does this MR do and why?
This MR removes the ci_job_jwt
feature flag, which has been enabled by default since before %13.0
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 #370128 (closed)