API QA: `/status` endpoint returns a response body that's not consistent with the docs

Description of the problem: Sending a GET request to /status endpoint results in this response body that doesn’t match the docs:

{
    "model_file": "models",
    "fingerprint": "5e0a7a1433b84d53843518203cef922c",
    "num_active_training_jobs": 0
}

• Used a rasa init project for this test case.

[ancalita]

@carlad I think the only thing required is to mark it as fixed in the QA plan for architecture revamp, and then we’ll see if this shows up when the 2nd QA pass is carried by the rest of the team.

[joejuzl]

Which is the source of truth? Should the docs be updated, or the endpoint response payload?

Good question - both need to be updated somewhat.

• “fingerprint” should now be called “model_id”. The value is correct but the key needs to change, and the docs.
• “model_file” should return the model file name, not the directory name.