Merge branch '207888-add-feature-flag-config' into 'master'

Add config for group_wiki feature flag

See merge request gitlab-org/gitlab!41692

ee/config/feature_flags/development/group_wiki.yml

+---
+name: group_wiki
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/29176
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/207888
+group: group::knowledge
+type: development
+default_enabled: false
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