server: whether check eof in forward stream
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type/enhancement
- Dominant language
- Go
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Description
## Enhancement Task
We check stream whether meets eof in [ReportBuckets](https://github.com/tikv/pd/blob/a330f0b523f0243c1b0455bd9222b5c247d4f7f5/server/grpc_service.go#L837),[RegionHeartbeat](https://github.com/tikv/pd/blob/a330f0b523f0243c1b0455bd9222b5c247d4f7f5/server/grpc_service.go#L912) and [TSO](https://github.com/tikv/pd/blob/a330f0b523f0243c1b0455bd9222b5c247d4f7f5/server/grpc_service.go#L181) when recieving.
But we don't judge errors in the forward stream, I am not sure whether need to do it.
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