Replace load_kube_config() with config_check()

[ChristianZaccaria]

Describe the Bug

Currently in generate_yaml.py config.load_kube_config() is called which can cause permission issues if someone authenticates with Token and server and lacks a config file.

Codeflare Stack Component Versions

Codeflare SDK: v0.7.0

Steps to Reproduce the Bug

• Make sure you do not have a kube config file in ~/.kube
• Follow the local interactive guided demo
• When creating the yaml file you should get an error that a kube config file does not exist