feat: add compartment-based node assignment

[t0mmylam]

Add Compartment-Based Node Assignment for Deployment Policies

This PR implements compartment-based node partitioning for Skyhook deployment policies, enabling fine-grained control over node selection and rollout strategies.

Key Changes:

• New compartment system: Added Compartment wrapper with node assignment logic based on label selectors
• Enhanced cluster state: Extended SkyhookNodes interface to support compartment management (AddCompartment, AddCompartmentNode)
• Node partitioning: Implemented partitionNodesIntoCompartments() function that assigns nodes to appropriate compartments or defaults
• Deployment policy integration: Updated BuildState() to create compartments from deployment policy specs
• Code quality: Refactored Reconcile() method to reduce cyclomatic complexity and fixed linting issues

Technical Details:

• Nodes are assigned to compartments based on LabelSelector matching
• Unmatched nodes automatically fall back to the "default" compartment
• Added comprehensive test coverage and mock interfaces
• Fixed mockery configuration path

This enables deployment policies to define compartments with specific node selectors, budgets, and strategies for more controlled rollouts across different node groups.