Publish notification AdjunctBatch completion

[donaldgray]

What does this change?

Resolves #1163

Update API and Engine to publish AdjunctBatch completion topic. This will happen whether the batch was successful or contains errors.

Main areas of change were:

• API - CreateAdjunctBatchHandler will raise if AdjunctBatch.Finished has a value
• Engine - EngineAssetRepository will raise if just-saved adjunct means batch is completed.

Other areas / details:

• IBatchCompletedNotificationSender takes a single IDeliverableBatch to share logic with Batch and AdjunctBatch.
• ITopicPublisher has and adjunct and asset "publish batch completed" overload but internally they share implementation.
• Refactored EngineAssetRepository to share more batch completion code, leveraging various shared interfaces IDeliverableBatchItem, IDeliverable and IDeliverableBatch

Infrastructure Changes

Note

This PR requires infrastructure changes.

• Required: N/A
• Optional: AdjunctBatch completion SNS topic. If present API or Engine will publish a notification when an AdjunctBatch is completed. If missing a warning will be logged.

Configuration Changes

Note

This PR introduces configuration changes.

Service	AppSetting	Required?	Description	Default
Engine	AWS:SNS:AdjunctBatchCompletedTopicArn	N	ARN for AdjunctBatch Completion SNS topic	null
API	AWS:SNS:AdjunctBatchCompletedTopicArn	N	ARN for AdjunctBatch Completion SNS topic	null