Merge branch 'issue-512935' into 'master'

Replace work item list tabs with search tokens

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/178379



Merged-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Approved-by: Nick Brandt <nbrandt@gitlab.com>
Approved-by: Jack Chapman <jachapman@gitlab.com>
Approved-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Reviewed-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Reviewed-by: Jack Chapman <jachapman@gitlab.com>
Co-authored-by: Chaitanya Sonwane <chaitanyadsonwane2002@gmail.com>