…anges include:queryref

…actored and renamed the 'executeGraphqlHelper' function to support the 'executeQuery' and 'executeMutation' functions.

…cleaned up unnecessary code.

… The two new functions are used to get different parameters and potentially throw detailed and tailored errors.

…into the connectorConfig so that executeGraphql and executeGraphqlRead don't try to retrieve data from wrong endpoints. Included unit tests for the executeMutation function.

…ned up some unnecessary comments.