Allow manual Import and Sync operations while all scheduled operations are suspended

When the scheduler is disabled it's not possible to run Import or Sync operations.  During solution development, initial data load and remediation activities it is often necessary to perform manual import and sync operations in specific orders while all scheduled other activity is suspended.  To achieve this right now all connector and link schedules must be individually disabled, which can be time consuming for non-simple solutions, and comes with an increased risk of schedules being left disabled inadvertently.

Provide some way to suspended scheduled operations, while allowing manual operations to continue to work.

I suggest adding a "Manual Operations Only" flag (or similar) to the dashboard.