feat: Test of no input example

[dstenroejl]

Description

• Implement an example of an orchestration with no input
• Implement test of the no input example

References

Link to assignment: https://app.zenhub.com/workspaces/mosaic-60a6105157304f00119be86e/issues/gh/energinet-datahub/team-mosaic/424

Checklist

• Should the change be behind a feature flag?
• Can the feature be meaningfully disabled or circumvented if there are issues (e.g., database-breaking changes)?
• Has it been considered whether data is being delivered to the wrong actor?
• Subsystem test executed (dev_002/dev_003)
• Is there time to monitor state of the release to Production?
• Reference to the task