Add AKS Machine API CRUD scale pipeline

[karenychen]

Summary

• add the Machine API CRUD perf-eval pipeline with canadacentral small/medium/large scale buckets for 10, 500, and 1000 machines
• add the k8s-cluster-crud-machine scenario Terraform inputs and test inputs
• add machine topology and engine collect/execute templates used by competitive-test
• keep the PR scoped to production perf pipeline files only; this intentionally excludes pipelines/system/new-pipeline-test.yml

Validation

• YAML/JSON parse smoke for changed pipeline, scenario, and step files
• terraform fmt -check -diff scenarios/perf-eval/k8s-cluster-crud-machine/terraform-inputs/azure.tfvars
• stage/dependency/matrix validation for pipelines/perf-eval/Autoscale Benchmark/k8s-cluster-crud-machine.yml
• git diff --check origin/main...HEAD
• confirmed no Python files differ from origin/main

[Copilot]

Pull request overview

Adds a new perf-eval pipeline and supporting scenario/topology/engine templates to run AKS Machine API CRUD + scale benchmarks in canadacentral at small/medium/large machine counts.

Changes:

• Introduces a scheduled perf-eval pipeline (10/500/1000 machines) that runs the competitive-test job with a matrix for Machine API scaling.
• Adds a new k8s-cluster-crud-machine scenario with Terraform inputs and Terraform validation test inputs.
• Adds new topology and engine templates for executing and collecting Machine API CRUD/scale results.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
steps/topology/k8s-cluster-crud-machine/validate-resources.yml	Topology validation step to ensure kubeconfig is available for the scenario.
steps/topology/k8s-cluster-crud-machine/execute-machine.yml	Topology execution wrapper that calls the Machine API engine execute step with matrix-provided parameters.
steps/topology/k8s-cluster-crud-machine/collect-machine.yml	Topology collection wrapper that calls the Machine API engine collect step for the region.
steps/engine/machine/k8s/execute.yml	Engine execution step that runs crud.main create-machine then scale-machine with batch/non-batch options.
steps/engine/machine/k8s/collect.yml	Engine collection step that runs crud.main collect and publishes results metadata.
scenarios/perf-eval/k8s-cluster-crud-machine/terraform-test-inputs/azure.json	Terraform validation JSON input for the scenario (used by CI terraform plan validation).
scenarios/perf-eval/k8s-cluster-crud-machine/terraform-inputs/azure.tfvars	Scenario infra definition (AKS CLI-based provisioning inputs, networking options, and ownership/deletion settings).
pipelines/perf-eval/Autoscale Benchmark/k8s-cluster-crud-machine.yml	New scheduled perf-eval pipeline with three scale buckets and stage gating for the largest run.