fix: Kubernetes Node Health check

[adityathebe]

resolves: #183

[Copilot]

Pull Request Overview

This PR fixes the Kubernetes Node health check functionality by implementing a comprehensive condition evaluation system. The changes replace the previous simplistic approach with a proper mapping of node conditions to their expected states and severity levels.

• Introduces a structured ConditionExpectation system to map node conditions to expected states and health severities
• Replaces the previous ad-hoc condition checking with a comprehensive lookup table covering standard Kubernetes conditions and vendor-specific conditions
• Improves the health determination logic to properly handle multiple conditions and their priorities

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
pkg/health/testdata/Kubernetes/Node/etcd-is-voter.yaml	Adds test data for a Kubernetes node with etcd voter condition to validate the new health check logic
pkg/health/health_node.go	Implements structured condition expectations mapping and refactors health evaluation logic with proper condition handling

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}