Alter health/reflection packages' build criterion

Using the presence of the `*_pb2_grpc` module, as opposed to the absence
of the build script (`*_commands` module) is a problematic choice,
because even if a generated file is present, the test infrastructure may
want to regenerate it under a different environment (e.g. different
Python/proto package version).  This will ensure the protos always get
recompiled if we have a `*_commands` module present, signaling we are in
a build environment, thereby making the process hermetic.

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