Merge branch 'ntepluhina-fix-workitem-token-input' into 'master'

Refactored WorkItemTokenInput to rely on reactive variables

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/140361



Merged-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Rajan Mistry <rmistry@gitlab.com>
Approved-by: Deepika Guliani <dguliani@gitlab.com>
Co-authored-by: NataliaTepluhina <tarya.se@gmail.com>