Retrieval Bot - Support multiple CID sources/clients

[jcace]

Description: Currently the Spade RB is only doing retrieval tests for DAG House. While the integration does support passing in multiple sources, we also need a way of identifying who the client is, in the task metadata - as this is used to filter i.e in the dashboard.

The filplus integration does this here , but we don't have the same document struct. We need to populate this field based on some other means.

ETA: YYY-MM-DD
Maintainer:

### Milestones
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Known dependencies:

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