Enable deterministic Go Protobuf marshaling (encoding)

[stapelberg]

While developing Go Protobuf, we found this line to be responsible for a test failure when enabling fully lazy extensions (Google-internal bug reference: b/328746084).

Your test seems to compare Protobuf-encoded data. As explained on go/go-proto-stability, you should not rely on the Protobuf wire encoding being stable across different versions of your program.

go/go-proto-stability lists a couple of strategies you could pursue for a more reliable test, but for now, to unblock our optimization, enabling deterministic marshaling side-steps many vectors for change.

[google-oss-prow]

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[google-oss-prow]

Hi @stapelberg. Thanks for your PR.

I'm waiting for a GoogleCloudPlatform member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[dchakarwarti]

cc: @shuoyang2016