[Feature Request] Make option for OTel workflow spans even if client span not present

[cretz]

Describe the solution you'd like

Today, if the client-created span is not present and on the headers, we don't create any workflow spans because they may be orphaned (especially on replay). But some users starting from schedules or CLI want the workflow spans even if they may be orphaned, so we should allow this opt-in on the tracing interceptor.