fix: do not fail silently on type constraint error in your variant file

For example variant has been failing silently on `type = "string"` (this needs to be `type = string`). This fixes that. The error message would now look like:

```
Error: Invalid type specification
  on example/test.variant line 3, in option "namespace":
   3:   type = "string"
A type specification is either a primitive type keyword (bool, number, string) or a complex type
constructor call, like list(string).
```

variant.go

@@ -706,6 +706,8 @@ func (r *Runner) Run(arguments []string, opt ...RunOptions) error {
 		r.runCmd, err = r.Cobra()
 
 		if err != nil {
+			r.ap.PrintError(err)
+
 			return err
 		}
 	}