Deployments datasource: support advanced filtering

[mitchnielsen]

Summary

Context: #343 (comment)

The Deployment datasource currently just supports getting a single deployment by name + flow name. It uses the Get Deployment by name endpoint.

There's also the Filter endpoint, which has a pretty detailed payload where you can define many filters. We could use this to expand the deployment datasource:

• Support retrieving multiple deployments in one datasource object that match the filter critera
• Support advanced filter criteria beyond just deployment name and flow name

Acceptance criteria

• Deployments datasource uses the filter endpoint instead of the 'get by name' endpoint
• Deployments datasource supports advanced filtering using the payload available from the filter endpoint
• Deployments datasource supports returning more than one deployment (any matching the filter criteria)