feat: add e2e tests for deployment policy

[t0mmylam]

Adds comprehensive end-to-end tests for DeploymentPolicy functionality, including multi-compartment rollouts, various strategies (Fixed, Linear, Exponential), and backwards compatibility with InterruptionBudget.

Changes

• 4 new E2E test suites covering core deployment policy features
• Prometheus metrics validation for all 8 rollout metrics
• CI integration with new deployment-policy-tests job
• Makefile targets for easy local testing
• Podman keyring quota fix for macOS and Linux

Testing

• All 4 test suites passing locally
• Metrics validation working correctly
• CI job configured and ready to run
• Tested on 15-node Kind cluster

Test Coverage

• ✅ Multi-compartment rollouts (15 nodes)
• ✅ Linear ramp-up strategy (8 nodes)
• ✅ Overlapping label selectors (6 nodes)
• ✅ Legacy InterruptionBudget compatibility (6 nodes)
• ✅ Prometheus metrics export and validation
• ✅ Budget enforcement (count and percent-based)
• ✅ Batch progression and state tracking

[lockwobr]

These tests are not making assertions it seems