Feat/ci tests v2 framework cpu hog

[ddjain]

Type of change

• Refactor
• New feature
• Bug fix
• Optimization

Description

Scenario

• CPU hog (hog_scenarios): runs a CPU stress workload on selected nodes for a set duration, then removes the hog pods.

Test cases

1. Success and lifecycle – Scenario runs, at least one hog pod appears during the run, process exits 0, no hog pods left after run.
2. Node selector and duration – Scenario runs with node-selector=kubernetes.io/os=linux and duration=10; exit 0 and run time in expected range (~8–90s).
3. Invalid node selector – Node selector matches no nodes; Krkn exits with failure (non-zero).
4. Invalid scenario YAML – Invalid scenario file; Krkn exits with failure (non-zero).
   Tests use ephemeral namespaces (no pre-deployed workload)

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