Have an error if a device composite is not found in the blueapi context

When injecting a device composite instead of a single device, if the composite has not been added to the module and not discoverable by blueapi, the only error that will show up on the blueapi logs is a `PydanticInvalidForJsonSchema` pointing to the first device in the composite, eg

```
raise self._value
pydantic.errors.PydanticInvalidForJsonSchema: Cannot generate a JsonSchema for core_schema.IsInstanceSchema ()
```

This is a bit confusing because it doesn't really give any information about where the error might be - in particular when the device otherwise connects and is used in other plans.

Related to #1525 . Run into this while testing on I19 and couldn't figure out what was missing until I took a look at the planFunctions module used in hyperion.