Remove StoreRepositoryXrayWorker class

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175976



Merged-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Approved-by: Serhii Yarynovskyi <syarynovskyi@gitlab.com>
Approved-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Reviewed-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Co-authored-by: sholaq <squadri@gitlab.com>