style(test_llms_template.py): change boolean values to True in 'show' key for some template fields

feat(test_llms_template.py): make 'task' and 'huggingfacehub_api_token' fields required
feat(test_llms_template.py): add options to 'task' field and display name to 'huggingfacehub_api_token' field