feat: initial commit for perf testing milo

[zachsmith1]

This pull request introduces a comprehensive performance testing suite for Milo, including new automation tasks, Kubernetes job templates, RBAC resources, and documentation. It also increases memory limits for Milo and Etcd components and adds a Prometheus ServiceMonitor for Etcd metrics. The changes enable end-to-end performance scenario execution, result collection, and resource cleanup, supporting scalable and reproducible benchmarking.

Performance Testing Suite

• Added perf:run and perf:cleanup tasks in Taskfile.yaml to automate running Milo performance scenarios and cleaning up test resources, including downloading results and handling environment overrides.
• Introduced Kubernetes Job templates for running (perf-runner-job.yaml) and cleaning up (perf-cleanup-job.yaml) performance tests, with proper environment variable injection and kubeconfig mounting.
• Created RBAC resources (perf-runner-rbac.yaml) to allow the performance runner jobs to manage ConfigMaps for result storage.
• Added a detailed README.md describing the performance runner workflow, configuration options, outputs, and usage examples.

Observability Improvements

• Added a Prometheus ServiceMonitor for Etcd in servicemonitor-etcd.yaml to enable metrics scraping in the milo-system namespace.

Resource Tuning

• Increased memory limits for Milo apiserver (deployment.yaml) and Etcd (helmrelease.yaml) from 512Mi to 2G to better support performance testing at scale.

Test Infrastructure

• Updated the test admin token user in auth-tokens-secret.yaml from 1001 to admin.

[joggrbot]

📝 Documentation Analysis

All docs are up to date! 🎉

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