analyse dashboard fails to parse Board.panels

[yarix]

• using cortex 0.10.7_windows_x86_64 dasboard analysys is broken for some dashboards (attached one example)
• dashboard downloaded from Grafana 8.4.1

C:\dev\cortex\cortextool>cortextool analyse dashboard "\Downloads\dash.json" --output=active.metrics.json
json: cannot unmarshal object into Go struct field Board.panels of type string for \Downloads\dash.json

dash.zip

in other cases, i get:

• cannot unmarshal object into Go struct field TemplateVar.templating.list.datasource of type string - where all teplmate vars works good in Grafana.
• unmarshal board: json: cannot unmarshal number 2.6666666666666665 into Go struct field Board.panels of type int - the json file does not contain any 2.6666 number

[eamonryan]

Duplicate of #241