Merge branch 'pl-error-tracking-gems' into 'master'

Move ErrorTrackingOpenAPI gem from vendor/gems to gems/

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/126351



Merged-by: Rémy Coutable <remy@rymai.me>
Approved-by: Rémy Coutable <remy@rymai.me>
Reviewed-by: Rémy Coutable <remy@rymai.me>
Reviewed-by: Peter Leitzen <pleitzen@gitlab.com>
Co-authored-by: Peter Leitzen <pleitzen@gitlab.com>