Tank test schema cases are regularly failing

Parent: [EPIC] Basic test coverage for all services (aura#175)

It looks like Tank test cases are failing generally:

Possible issues, but maybe other reasons too: Test case failed due to wrong comparison.

It appears that this test case fails because the returned value is a JSON object instead of an integer:

1. The received response does not conform to the defined schema!
Details: 
{'step': 'fetching', 'progress': 0} is not of type 'integer'
Failed validating 'type' in schema['properties']['results']['items']['properties']['progress']
Response status: 200
Response payload: `{"results":[{"state":"running","created":"2022-08-25T17:18:38Z","started":"2022-08-25T17:18:38Z","id":7,"show":"00","user":"anonymous","source":"upload://\u003cfilename\u003e","progress":{"step":"fetching","progress":0}}]}`
Run this cURL command to reproduce this failure: 

This is likely due to the repeating use of the progress key:

"progress":{"step":"fetching","progress":0}}]}