Merge branch '420726-remove-v1-files' into 'master'

Copy MR Widget V1 files to V2 folder

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142414



Merged-by: Miranda Fluharty <mfluharty@gitlab.com>
Approved-by: Miranda Fluharty <mfluharty@gitlab.com>
Reviewed-by: Miranda Fluharty <mfluharty@gitlab.com>
Co-authored-by: Savas Vedova <svedova@gitlab.com>