feat: add endpoint for gke ingress health check

[cunkz]

Description

Add new endpoint for GKE Ingress health check. GKE Ingress need single endpoint which return 200 OK. https://cloud.google.com/kubernetes-engine/docs/concepts/ingress#def_inf_hc https://cloud.google.com/kubernetes-engine/docs/concepts/ingress#direct_hc

Type of change

Please delete any options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist

• [x] My code follows the style guidelines of this project
• [x] I ran ESLint and other linters for modified files
• [x] I have performed a self-review of my own code and tested it
• [x] I have commented my code, particularly in hard-to-understand areas (including JSDoc for methods)
• [x] My changes generate no new warnings
• [ ] My code needed automated testing. I have added them (this is optional task)

Screenshots (if any)