[DPP] Contract negotiation failing because of CORS and check of "/" at end of provider url in dt

[matbmoser]

Current Behavior

Usage of CORS is necessary when using two different bsae URLs for backend and frontend.

There is a problem with cors with the agree, and negotaition status methods:
Because we send the headers with the forcing of credentials.
This happens when you have the backend and the frontend separated in two instances.

Solution

Remove this property from the frontend

Expected Behavior

No CORS errors

[saudkhan116]

The bug is now resolved, but still need to be tested.