Broken by afbb9d51f1 which changed some strings.
afbb9d51f1
Use standard error wrapping/unwrapping instead. The conversion is mostly straightforward, but see grpc/grpc-go#2934 for GRPC `status.FromError`, it doesn't currently support unwrapping/errors.As(), so we're unwrapping manually here.
Signed-off-by: Pavel Korotkov <pavel@nspcc.ru>