Fix lint error

pkg/testhelper/op/op.go

@@ -1,7 +1,6 @@
 package op
 
 import (
-	"fmt"
 	"github.com/1Password/onepassword-operator/pkg/testhelper/system"
 )
 
@@ -13,12 +12,3 @@ func UpdateItemPassword(item string) error {
 	}
 	return nil
 }
-
-// ReadItemPassword reads the password of an item in 1Password
-func ReadItemPassword(item, vault string) (string, error) {
-	output, err := system.Run("op", "read", fmt.Sprintf("op://%s/%s/password", vault, item))
-	if err != nil {
-		return "", err
-	}
-	return output, nil
-}