Allow Rollback Execution for Scheduled Network Changes

NetBrain currently prevents a rollback from being executed if the target devices are associated with a scheduled network change, returning an error that blocks the action entirely. This limitation can delay recovery during an active incident, since users must first cancel or modify the scheduled change before the rollback can proceed. This enhancement would allow a rollback task to execute independently of an existing scheduled change, or provide a clear override option that lets users prioritize the rollback without deleting or reworking the original schedule. Enabling faster, unblocked rollback execution reduces incident response time and minimizes service disruption when a configuration change causes unexpected outages.