Remove POST /ci/lint
What does this MR do and why?
This MR removes the deprecated POST /ci/lint endpoint and the ci_remove_post_lint
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.
Related to #403256 (closed)