code: def validate_environment():
      if "GOOGLE_APPLICATION_CREDENTIALS" not in os.environ:
          raise ValueError(
              "Missing required environment variable - GOOGLE_APPLICATION_CREDENTIALS"
          )
      if "GOOGLE_KMS_RESOURCE_NAME" not in os.environ:
          raise ValueError(
              "Missing required environment variable - GOOGLE_KMS_RESOURCE_NAME"
          )
  
imports: import litellm, os
  from typing import Optional
  from litellm.proxy._types import KeyManagementSystem
label_desc: Use image node_id 1 for calling a global function with example usage: validate_environment() without return types