monitoring: update CustomResourceStateMetrics to v1 and fix metric naming conventions

[mrhapile]

What type of PR is this?

fix(monitoring): update CustomResourceStateMetrics to v1 and align metric naming

---

What this PR does / why we need it:

This PR updates the CustomResourceStateMetrics configuration in the gateway-addons chart to align with the current Gateway API v1 resources and kube-state-metrics naming conventions.

Specifically, this change:

• Updates all groupVersionKind.version fields from deprecated v1alpha* versions to v1 for:

  • Gateway
  • GatewayClass
  • HTTPRoute
  • GRPCRoute
  • TCPRoute
  • TLSRoute
  • UDPRoute
  • BackendTLSPolicy

• Adds nilIsZero: true to all deletionTimestamp gauge metrics to prevent nil resolution warnings such as:
  "got nil while resolving path"

• Renames Info metrics from labels to labels_info to comply with the kube-state-metrics _info suffix requirement and eliminate warnings like:
  "Info metric does not have _info suffix"

These updates remove deprecated API warnings (e.g. BackendTLSPolicy v1alpha3 deprecation warnings), prevent noisy log errors for deleted resources, and ensure compatibility with the current Gateway API and kube-state-metrics behavior.

This change only affects monitoring configuration. No API changes or behavioral changes to Gateway functionality are introduced.

---

Which issue(s) this PR fixes:

Fixes #8284

---

Release Notes: Yes

[netlify]

✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

Name	Link
🔨 Latest commit	3b0332e
🔍 Latest deploy log	https://app.netlify.com/projects/cerulean-figolla-1f9435/deploys/6994458ab4805a0008173d98

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.59%. Comparing base (e56785c) to head (3b0332e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8286      +/-   ##
==========================================
+ Coverage   73.57%   73.59%   +0.01%     
==========================================
  Files         242      242              
  Lines       37000    37000              
==========================================
+ Hits        27224    27231       +7     
+ Misses       7854     7850       -4     
+ Partials     1922     1919       -3     

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