chore(config): bump opstool AKS to 1.35 for fleet parity (AROSLSRE-1414)

[raelga]

AROSLSRE-1414 (parent AROSLSRE-863)

What

Bump the opstool AKS kubernetesVersion in config/config-dev-ci.yaml from "1.34" to "1.35" — the final hop to fleet parity.

Why

opstool-usw3 is now on 1.34 (control plane and all three node pools at 1.34.8), while the rest of the fleet runs 1.35. This PR closes the gap. AKS upgrades one minor at a time; az aks get-upgrades confirms 1.35.x is the available target from 1.34.

Bumping kubernetesVersion drives the opstool-aks-pipeline (dev-infrastructure/scripts/upgrade-aks-cluster.sh → az aks upgrade) to upgrade the control plane and roll the node pools onto 1.35.

Testing

No code paths change; this is a config version bump validated by the existing config schema (config/config-dev-ci.schema.json types kubernetesVersion as a string). cd config && make materialize produces no rendered-config changes (opstool config is not part of the rendered tree).

Post-deploy validation on opstool-usw3:

• az aks show ... --query kubernetesVersion → 1.35
• az aks nodepool list ... --query "[].currentOrchestratorVersion" → 1.35.x on all pools

Special notes for your reviewer

Scope is intentionally limited to opstool (dev-ci). This completes the sequence 1.32 → 1.33 (#5936, pipeline fix #5988) → 1.34 (#6042) → 1.35, each rolled out and verified on opstool-usw3.

PR Checklist

• PR is scoped to a single task (no mixed concerns)
• Title follows Conventional Commits format
• Summary explains the "Why" behind the change
• Linked to relevant ticket/issue
• Screenshots included (if graph/UI/metrics changes)
• Self-reviewed the diff
• CI/CD checks are passing (ignore Tide)
• Draft PR used for WIP (if applicable)
• Commit history is clean (rebased/squashed)
• Tricky code blocks are commented
• Specific reviewers tagged
• All comment threads resolved before merge

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Pull request overview

Updates the dev-ci opstool AKS Kubernetes minor version to align opstool with the rest of the fleet’s current 1.35 baseline.

Changes:

• Bump clouds.dev.defaults.opstool.aks.kubernetesVersion in config/config-dev-ci.yaml from "1.34" to "1.35".