Merge branch 'docs-required-pipeline-deprecation' into 'master'

Add deprecation note to required pipeline config

Closes #34350

See merge request gitlab-org/gitlab!20626

doc/user/admin_area/settings/continuous_integration.md

@@ -161,6 +161,11 @@ but commented out to help encourage others to add to it in the future. -->
 
 ## Required pipeline configuration **(PREMIUM ONLY)**
 
+CAUTION: **Caution:**
+The Required Pipeline Configuration feature is deprecated and will be removed when an
+[improved compliance solution](https://gitlab.com/gitlab-org/gitlab/issues/34830)
+is added to GitLab. It is recommended to avoid using this feature.
+
 GitLab administrators can force a pipeline configuration to run on every
 pipeline.