Add json support to destroy group controller action

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/182640



Merged-by: Gosia Ksionek <mksionek@gitlab.com>
Approved-by: Abdul Wadood <awadood@gitlab.com>
Approved-by: Gosia Ksionek <mksionek@gitlab.com>
Co-authored-by: Peter Hegman <phegman@gitlab.com>