Merge branch 'add-json-type-to-breaking-change-guide' into 'master'

Specify JSON as a distinct type in the breaking API change definition

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/136797



Merged-by: Luke Duncalfe <lduncalfe@gitlab.com>
Approved-by: Luke Duncalfe <lduncalfe@gitlab.com>
Reviewed-by: Luke Duncalfe <lduncalfe@gitlab.com>
Co-authored-by: drew <dscimino@gmail.com>