GCS_MAVLink: allow uploading GCS to cancel upload using mission_clear_all #27854
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these would appear to be identical operations.clear differs from a 0-item-upload in the "clear" is only allowed disarmed, and resets a whole bunch of mission state (e.g. the loaded item).Replaces #15669 . Like the PR it replaces, this allows a GCS to cancel an upload with a clear-all command as if they'd issues a mission-upload with zero items.