Merge branch 'jtucker/dump-nav-rake-task' into 'master'

[#442753] Add rake task to dump nav structure as YAML

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148204



Merged-by: Thong Kuah <tkuah@gitlab.com>
Approved-by: Thong Kuah <tkuah@gitlab.com>
Co-authored-by: Jeff Tucker <jtucker@gitlab.com>