Replace the deprecated gRPC dial options in Hubble CLI, Hubble-relay (peer client + observer client). This includes grpc.WithBlock at the very least, but there may be a few other options too.

Functionally, removing the WithBlock option will mean connection failures will only surface when making an RPC, not on the Dial.

Context

gRPC Go deprecated DialContext with version v1.63.0. We consistently use DialContext with grpc.WithBlock(). So switching to the recommended NewClient would change the behavior.

We need to figure out if we should change the behavior or somehow keep the current behavior while using NewClient.

Acceptance Criteria

• The deprecated DialContext calls are replaced
• Other deprecated gRPC dial options are removed/replaced.
• Verify tests are reliable, they may become flakey. They likely will rely on the blocking behavior.

Related Links

• Upstream points out our current approach is an anti-pattern: https://github.com/grpc/grpc-go/blob/master/Documentation/anti-patterns.md#dialing-in-grpc