Merge branch '378686-followers-tab' into 'master'

Build out Followers tab in Vue user profile

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/120382



Merged-by: Anna Vovchenko <avovchenko@gitlab.com>
Approved-by: Anna Vovchenko <avovchenko@gitlab.com>
Approved-by: Laura Meckley <lmeckley@gitlab.com>
Approved-by: Sascha Eggenberger <seggenberger@gitlab.com>
Approved-by: Alex Buijs <abuijs@gitlab.com>
Reviewed-by: Kamil Trzciński <ayufan@ayufan.eu>
Reviewed-by: Peter Hegman <phegman@gitlab.com>
Reviewed-by: Anna Vovchenko <avovchenko@gitlab.com>
Reviewed-by: Laura Meckley <lmeckley@gitlab.com>
Co-authored-by: Peter Hegman <phegman@gitlab.com>