Merge branch 'lint-mermaid' into 'master'

Add NodeJS script to check mermaid

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144328



Merged-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Laura Callahan <lmeckley@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Rémy Coutable <remy@rymai.me>
Approved-by: Deepika Guliani <dguliani@gitlab.com>
Reviewed-by: Ammar Alakkad <aalakkad@gitlab.com>
Reviewed-by: Rémy Coutable <remy@rymai.me>
Co-authored-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Peter Leitzen <pleitzen@gitlab.com>