Parameter to prevent searching project level work items

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166781



Merged-by: Heinrich Lee Yu <heinrich@gitlab.com>
Approved-by: Mario Celi <mcelicalderon@gitlab.com>
Approved-by: Alexandru Croitor <acroitor@gitlab.com>
Approved-by: Omar Qunsul <oqunsul@gitlab.com>
Approved-by: Heinrich Lee Yu <heinrich@gitlab.com>
Reviewed-by: Mario Celi <mcelicalderon@gitlab.com>
Co-authored-by: Donald Cook <dcook@gitlab.com>