Fix bug where grpc self-observability metrics were not added #900
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In #885, I only added grpc observability metrics when insecure = true. This passed our tests that use a local, fake grpc server, but didn't work for the general case.
It turns out that the metrics were actually coming from the client library, which enables opencensus metrics by default. After the OC bridge was removed, those metrics disappeared.
This PR adds grpc metrics for the non-insecure case.
TESTED=checked that the e2e test project contains grpc self-obs metrics