build: update system tests to test protobuf implementation #1321
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Updates system tests to run with
PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION
which tests the following protobuf implementations:python
,cpp
,upb
.cpp
can be removed once support for Protobuf 3.x is removed from setup.py.See https://github.com/protocolbuffers/protobuf/tree/main/python#implementation-backends
Also fixes a failing test when
PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python
is used, which could be a bug inprotobuf
. If this looks like a bug, we can file an issue upstream.