fix: ignore grpc.ErrServerStopped in MockServer serve goroutine to st…

[Dosik13]

Description:

Fix intermittent unit-test CI panic panic: grpc: the server has been stopped originating from the MockServer serve goroutine in sdk/mock_test.go. The goroutine was panicking on any non-nil error from grpc.Server.Serve, including the expected grpc.ErrServerStopped sentinel returned after a normal GracefulStop. Under -race and CI load, the serve goroutine can be scheduled after MockServer.Close has already called GracefulStop, at which point Serve returns ErrServerStopped and the whole test binary aborts.

• Filter grpc.ErrServerStopped from the panic in NewMockServer's serve goroutine.
• Use a local err inside the goroutine instead of closing over the outer err declared in NewMockServer.
• Add errors to the imports in sdk/mock_test.go.

Related issue(s):

Fixes #1700

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

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[codacy-production]

Up to standards ✅

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
see 3 files with indirect coverage changes

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