deleteRunBatch
Deletes the individual workflow runs within a batch. This operation is separate from DeleteBatch, which removes the batch metadata.
Delete is only allowed on batches in PROCESSED or CANCELLED state. Delete operations are non-atomic and may be partially successful. Use GetBatch to review successfulDeleteSubmissionCount and failedDeleteSubmissionCount in the submissionSummary. Only one cancel or delete operation per batch is allowed at a time.