Fix model_id bug with InferenceAggregator block

[robiscoding]

Description

• Changing model_id to a runtime param instead of init param since init was failing:

{
  "inner_error": "ModelMonitoringInferenceAggregatorBlockV1.__init__() missing 1 required positional argument: 'model_id'"
}

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How has this change been tested, please provide a testcase or example of how you tested the change?

• Updated tests
• Tested on staging, example output:

[
  {
    "$inputs.image": {...},
    "$steps.model.inference_id": "075298ae-4810-402f-95cd-91677c866470",
    "$steps.model.predictions": {...},
    "$steps.model.model_id": "animals/1",
    "$steps.model_monitoring_inference_aggregator.error_status": false,
    "$steps.model_monitoring_inference_aggregator.message": "Data sent successfully",
    "$steps.bounding_box_visualization.image": {
      "type": "base64",
      "value": ""...
      "video_metadata": {...}
    }
  }
]

Any specific deployment considerations

For example, documentation changes, usability, usage/costs, secrets, etc.

Docs

• Docs updated? What were the changes: