Remove custom_webhook_headers feature flag
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What does this MR do and why?
Remove custom_webhook_headers feature flag
Relates to #448604 (closed)
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
No changes to UI
How to set up and validate locally
Just verify that custom webhook headers still work
Edited by 🤖 GitLab Bot 🤖