Support enabled flag for individual rest-java routes in Helm

[steven-sheehy]

Problem

We need a way to rollout the new Java-based APIs gradually while still keeping the legacy JavaScript APIs as a fallback.

Solution

• Support the feature in both API Gateway and Ingress
• Add an ingress.hosts.paths.enabled flag
• Since gateway.rules is templated, we can probably just add an {{ if false }} around rules, but needs testing
• Investigate feasibility of percentage-based routing

Alternatives

No response