CLI: Do not print out help if the response is a 404

[raulb]

Currently, if a CLI command is executed correctly, but its response is a 404, the error is returned, and automatically the help is printed.

Example:

Here, I'm trying to describe a non-existent pipeline, and notice how help is automatically printed out.

$ conduit pipelines describe foo
Error: failed to get pipeline: rpc error: code = NotFound desc = failed to get pipeline by ID: pipeline instance not found (ID: foo): pipeline instance not found
Usage:
  conduit pipelines describe [flags]

Aliases:
  describe, desc

Examples:
conduit pipelines describe pipeline-with-dlq
conduit pipelines desc multiple-source-with-processor

Flags:
  -h, --help   help for describe

Global Flags:
      --api.grpc.address string   address where Conduit is running
      --config.path string        path to the configuration file

failed to get pipeline: rpc error: code = NotFound desc = failed to get pipeline by ID: pipeline instance not found (ID: foo): pipeline instance not found
exit status 1

Expected output

$ conduit pipelines describe foo
pipeline instance not found (ID: foo): pipeline instance not found

What to do

We'll need to not show help if the error is expected. Only show help when there is unexpected behavior (wrong flags, wrong args, etc.).