Set verbosity to 2 for Python tests

src/python/interop/interop/_insecure_interop_test.py

src/python/interop/interop/_secure_interop_test.py

...grpc/_adapter/_blocking_invocation_inline_service_test.py

src/python/src/grpc/_adapter/_c_test.py

...apter/_event_invocation_synchronous_event_service_test.py

...ter/_future_invocation_asynchronous_event_service_test.py

src/python/src/grpc/_adapter/_links_test.py

src/python/src/grpc/_adapter/_lonely_rear_link_test.py

src/python/src/grpc/_adapter/_low_test.py

src/python/src/grpc/early_adopter/implementations_test.py

src/python/src/grpc/framework/base/implementations_test.py

...framework/face/blocking_invocation_inline_service_test.py

...k/face/event_invocation_synchronous_event_service_test.py

...face/future_invocation_asynchronous_event_service_test.py

src/python/src/grpc/framework/foundation/_later_test.py

...ython/src/grpc/framework/foundation/_logging_pool_test.py

test/compiler/python_plugin_test.py