Test Permissions for BigQuery service account

[igrankova]

Tell us about the problem you're trying to solve

1. Create the service account
2. Compare permissions for super-admin and view-user for the same table.

[igrankova]

Test Results:

1. Permissions to dataset are in priority and allow access to all tables in this dataset independently of the table(s) permissions.
2. If user has permissions to access table(s) in the dataset, but doesn't have permissions to access the dataset, the access to the table(s) is denied.