Test jsonConfig against schema

[foxriver76]

as admin now also validates the json config against the schema it would be nice to have this in adapter tests too

https://github.com/ioBroker/adapter-react-v5/blob/main/schemas/jsonConfig.json

[mcm1957]

Attention:
As jsonConfig Tests often fail due to (often small) errors in checking schema a forced testing of json schema could be problematic. At least a possibility to disable the check must be provided (i.e. like disabling linter tests)