VIP does not return a proper response code

## Expected/Desired Behavior

The status code returned by wp should be properly set, this helps with command chaining or handling failures.

```
$ wp ajsodjasiodjsaiod
Error: 'ajsodjasiodjsaiod' is not a registered wp command. See 'wp help' for available commands.

$ echo $?
1

$ vip @app.env wp ajsodjasiodjsaiod
Error: 'ajsodjasiodjsaiod' is not a registered wp command. See 'wp help' for available commands.

$ echo $?
1
```

## Actual Behavior

```
$ wp ajsodjasiodjsaiod
Error: 'ajsodjasiodjsaiod' is not a registered wp command. See 'wp help' for available commands.

$ echo $?
1

$ vip @app.env wp ajsodjasiodjsaiod
Error: 'ajsodjasiodjsaiod' is not a registered wp command. See 'wp help' for available commands.

$ echo $?
0
```

## Steps to Reproduce the Problem

1. Step 1: Run a `vip @app.env wp` command that throws an error or otherwise returns an error status code through standard WP CLI.
1. Step 2: Check the returned status code, and notice it is always "0".