[release/8.0] Explicitly specify grpc OTLP protocol with env var #3417
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Backport of #3384 to release/8.0
/cc @JamesNK
Customer Impact
The dashboard only supports OTLP over gRPC. Most SDK's OTLP exporters default to gRPC but we should be explicit in case there are exporters that prefer another protocol. We want them to use grpc.
There was a customer report of Python using Protobuf/JSON over HTTP. That failed because the dashboard doesn't support it.
Testing
Unit testing and manual testing.
Risk
Low.
Microsoft Reviewers: Open in CodeFlow