Merge branch 'ph/442911/mergeRequestListAuthorFilter' into 'master'

Added author filter to Vue merge request list app

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/145826



Merged-by: Kushal Pandya <kushal@gitlab.com>
Approved-by: Kushal Pandya <kushal@gitlab.com>
Co-authored-by: Phil Hughes <me@iamphill.com>