Minor Istio refactoring

Infrastructure Submissions:

---

• [YES] Have you added an explanation of what your changes do and why you'd like us to include them?
• [NO] I have updated the documentation accordingly.
• [NA] I have added tests to cover my changes.
• [NA] All new and existing tests passed.
• [NA] I have formatted the terraform code. (terraform fmt -recursive && go fmt ./...)

Current Behavior or Linked Issues

---

• added compatible load balancer annotation for AKS > 1.24
• keeping the beta annotation as Azure policies (managed by MS) are still relying on it and do not accept new annotation yet.
• added cpu/memory limits for tracing addon to avoid uncontrolled memory consumption:

(by default it doesn't have any limits set, so consuming all memory available on node/VM)

Does this introduce a breaking change?

---

• [NO]