Revert "Update grpc protoc plugin to be compliant of proto3 field presence" #23089
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Reverts #22998
Because this breaks internal targets - https://g3c.corp.google.com/results/invocations/c787c170-933c-4d84-88db-908739d593c1/targets/%2F%2Fgooglex%2Fdaedalus%2Fembedded%2Fbase%2Fnet%2Fngrpc2%2Fclient:channel_test/log