fix(DMVP-9224): support templates injection in httproute routes configs

[mrdntgrn]

Summary

This commit enables template evaluation inside httpRoutes rule rendering in the gateway-api chart, so route fields can reference chart values (e.g., environment-specific backend names). It also updates the related example and bumps the chart version.

Key Changes

• Bumped charts/gateway-api/Chart.yaml version from 0.1.6 to 0.1.7.
• Updated charts/gateway-api/templates/httproute.yaml to render route rule YAML through tpl, enabling value/template injection in route config fields.
• Updated examples/gateway-api/with-template-hostname.yaml to demonstrate templated backend service naming:
  • backendRefs[].name: "{{ .Values.global.environment }}.api-v1".

Testing/Verification

• Verified commit content via latest commit diff (git show -1) and file-level patch review.

[what-the-diff]

PR Summary 📃

• Chart Version Upgrade 📈
  We've successfully bumped up the chart version from 0.1.6 to 0.1.7 in our charts/gateway-api/Chart.yaml. This simply represents a new edition of our project, making it ready for further improvements and additions. Let's celebrate this small but significant progress! 🎉

• Enhanced Rule Rendering 🎨
  Next, we have revamped the way we process and display rules in our charts/gateway-api/templates/httproute.yaml. Switching from toYaml to the more dynamic tpl for template processing makes handling different values in the future easier and more flexible. Essentially, it's like upgrading from a limited set of brushes to a full artist's toolkit. 🖌️

• Backend Reference Name Update 🏷️
  Lastly, we have updated the backend reference name in examples/gateway-api/with-template-hostname.yaml. With this change, we can now use a templated approach for the environment name. It's a bit like giving a personalized name tag to our project, allowing it to adapt to different environments with ease! It's a step forward for flexibility. 👏

Always remember, every update, no matter how small, brings us one step closer to our ultimate product vision. Let's keep rocking! 🚀