Query cancellation: Correctly cancel queries

[ivanahuckova]

Cancelling a query does not stop its execution due to missing NewRequestWithContext.

Testing:

• You can use following url to run query https://fakestoreapi.com/products?limit=5000. Make sure that you cancel as fast as possible as it might execute quite fast
  1. Check logs/metrics for status=cancelled (previously status=ok)
  2. If you want, you can use debugger and observe that the query is now cancelled (previously it continued to run)

Fix: Query cancellation now works correctly by using NewRequestWithContext. See attached logs for confirmation:

I have also lowered the levels of logged "errors", as we were getting error logs also for context.canceled. Switching to debug to reduce noise.