refactor: move kai-scheduler and DRA driver to base overlay for CNCF AI conformance

[yuanchen8911]

Summary

Move nvidia-dra-driver-gpu and kai-scheduler component definitions from overlay-specific configs into base.yaml.

Motivation / Context

Both training and inference clusters need gang scheduling (kai-scheduler) and DRA support (nvidia-dra-driver-gpu) to meet CNCF AI Conformance requirements. Moving them to base ensures all recipe variants include these components. Overlays retain only environment-specific overrides (EKS: controller affinity/tolerations, Kind: nvidiaDriverRoot).

Fixes: N/A
Related: N/A

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (no functional changes)
• Build/CI/tooling

Component(s) Affected

• CLI (cmd/eidos, pkg/cli)
• API server (cmd/eidosd, pkg/api, pkg/server)
• Recipe engine / data (pkg/recipe)
• Bundlers (pkg/bundler, pkg/component/*)
• Collectors / snapshotter (pkg/collector, pkg/snapshotter)
• Validator (pkg/validator)
• Core libraries (pkg/errors, pkg/k8s)
• Docs/examples (docs/, examples/)
• Other: ____________

Implementation Notes

• CUJ1 training test assertion updated to include the two new base components in componentRefs and deploymentOrder
• Overlay-specific overrides preserved (EKS affinity/tolerations, Kind nvidiaDriverRoot)

Testing

make test
make lint

Risk Assessment

• Low — Isolated change, well-tested, easy to revert
• Medium — Touches multiple components or has broader impact
• High — Breaking change, affects critical paths, or complex rollout

Rollout notes: N/A

Checklist

• Tests pass locally (make test with -race)
• Linter passes (make lint)
• I did not skip/disable tests to make CI green
• I added/updated tests for new functionality
• I updated docs if user-facing behavior changed
• Changes follow existing patterns in the codebase
• Commits are cryptographically signed (git commit -S)

[mchmarny]

/lgtm