Allow helm users to disable kong and use the ingress

[mkhpalm]

This change allows helm users to disable kong and enable the app.ingress without getting an error.

Fixes: #8972

https://kubernetes.io/docs/concepts/services-networking/ingress/#examples

Example values:

app:
  ingress:
    enabled: true
    hosts:
    - example.tld
kong:
  enabled: false

[linux-foundation-easycla]

• ✅login: mkhpalm / (4f7700b)
• ✅login: mkhpalm / (4f7700b, 8d283a7)

The committers listed above are authorized under a signed CLA.

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[floreks]

That's not something we'd want to support directly. The reason is that ingress has its limitations and can't support multiple backend protocols in a single ingress instance, i.e. gRPC and HTTP(s) (rest or gql). We know for sure that we will be migrating our backend architecture further and this configuration will eventually stop working. It would require multiple ingresses and that's not something we want to promote. That is why we want to use API Gateway which will handle everything and expose a single public-facing API.

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PR needs rebase.

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[VergeDX]

@floreks Consider using gateway api.
Also, If you want a background migrating, you can revert this commit anytime.