Remove flag exemption for web hook rate limits
What does this MR do and why?
This removes a flag that had been added to webhook rate limits in order to provide an exemption for a single customer. The exemption was in order to rollout the rate limit feature while causing minimal disruption to existing customers.
The customer is now in a position where we can remove the exemption permanently and be subject to webhook rate limits.
There is a Changelog entry because Danger is enforcing it.
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 #366081