[BugFix] Charting Integration Tests

[hjoaquim]

1. Why? (1-3 sentences or a bullet point list):

   • Charting integration tests breaking.

2. What? (1-3 sentences or a bullet point list):

   • Remotes the default value for the Chart.format and outsource that responsibility for the extension.
   • The extension explicitly says what's the format during chart creating (obbject.chart = Chart(...))

3. Impact (1-2 sentences or a bullet point list):

   • NA

4. Testing Done:

   • Running integration tests.
   • Running endpoints with and without charting implementation (python + api)