Merge branch '454251-add-embeddings-to-issues' into 'master'

Add embeddings to issues if on Elasticsearch 8+

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/149209



Merged-by: Dmitry Gruzd <dgruzd@gitlab.com>
Approved-by: Dmitry Gruzd <dgruzd@gitlab.com>
Reviewed-by: Dmitry Gruzd <dgruzd@gitlab.com>
Co-authored-by: maddievn <mvanniekerk@gitlab.com>