Fixing the detection of public Istio Gateways

[slashben]

This pull request includes significant changes to the rules/exposure-to-internet-via-istio-ingress/raw.rego file, primarily focused on improving the logic for identifying whether a gateway is public and adding debug print statements.

Improvements to gateway exposure logic:

• Replaced the previous logic for identifying the Istio Ingress Gateway with a new is_gateway_public function that checks if the gateway is exposed via a LoadBalancer service or has a "public" suffix. [1] [2]

[github-actions]

Summary:

• License scan: failure
• Credentials scan: failure
• Vulnerabilities scan: failure
• Unit test: success
• Go linting: success