ref_int - add showcases

[PiotrKorkus]

What

Improve current /showcases implementation by extending with more examples for modules that are integrated (based on known_good.json) and are missing their showcases.

Extend standalone showcases with the examples directly from Modules - same as it is currently done for score_communication.

Create additional complex showcases that will combine multiple Modules.

Acceptance Criteria (DoD)

Additional examples have been added.
Showcases are building and running for all available configurations.

How

No response