Json output isn't clean when getting cvm info

[youben11]

When running phala cvms get -j <app_id>, I get the two lines preceding the json output. For example:

✓ CVM with App ID app_xxxxxxxxxxxxxxxxxxxxxxxxxxxx detected
⟳ Fetching CVM with App ID app_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx... ✓

{
   ... json here
}

Those lines are also printed to stdout, so there in no way to make them go away with a 2>/dev/null.

It would be great to have the ability to get the json only in the output.