fix: conditionally set ingress-nginx chart version based on cadence and K8s minor version (PSCLOUD-99)

[abhi44706]

Changes

• This PR implements conditional logic to set INGRESS_NGINX_CHART_VERSION based on V4_CFG_CADENCE_VERSION when the Kubernetes minor version is greater than or equal to the defined threshold (ingressVersions.k8sMinorVersion.value).
• If K8s minor ≥ threshold:
  • Cadence ≤ 2025.07 → 4.12.1
  • Cadence ≥ 2025.08 → 4.13.0
• If K8s minor < threshold:
  • Leave empty ("")
• User-defined INGRESS_NGINX_CHART_VERSION in ansible-var.yaml will always take precedence.

Test Scenarios:

• K8s minor ≥ 33 & Cadence ≥ 2025.08 → INGRESS_NGINX_CHART_VERSION = 4.13.0 ✅ Passed
• K8s minor ≥ threshold & Cadence ≥ 2025.08 → INGRESS_NGINX_CHART_VERSION = 4.13.0 ✅ Passed
• K8s minor ≥ threshold & Cadence ≤ 2025.07 → INGRESS_NGINX_CHART_VERSION = 4.12.1 ✅ Passed
• User-defined INGRESS_NGINX_CHART_VERSION in ansible-var.yaml → Retained as-is ✅ Passed

[saschjmil]

LGTM