Tracking issue for the CR v0.21 release.

Current idea is to release after the Kubernetes 1.33 release (23rd April) depending on maintainer availability / bandwith.

Things we should mention in the release notes:

• How to preserve v0.20 qps/ burst config (including mentioning the old default values): ⚠️ Config: Disable client-side ratelimiter by default #3119 (comment)