Move self.matches to BaseInput

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/137144



Merged-by: Fabio Pitino <fpitino@gitlab.com>
Approved-by: Fabio Pitino <fpitino@gitlab.com>
Reviewed-by: Fabio Pitino <fpitino@gitlab.com>
Co-authored-by: Avielle Wolfe <awolfe@gitlab.com>