test: Add e2e tests for GPU ECC NPD health checks

[ganeshkumarashok]

Adds AgentBaker e2e tests for the new GPU ECC Node Problem Detector plugin (check_gpu_ecc.sh / custom-plugin-gpu-ecc.json), covering:

• ValidateNPDGPUECCPlugin: verifies the plugin config file is present
• ValidateNPDGPUECCCondition: polls GPUECCError node condition, expects GPUECCErrorIsNotPresent / ConditionFalse when hardware is healthy
• ValidateNPDGPUECCConditionAfterFailure: injects a fault (replaces the plugin script with one that exits 1 with NHC2019 output), waits for NPD to report GPUECCErrorIsPresent / ConditionTrue, then restores

Tests run as part of runScenarioGPUNPD on ECC-capable SKUs:
Standard_ND96isr_H100_v5 (UAE North)
Standard_ND96asr_v4 (South Central US)

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[github-actions]

PR Title Lint Failed ❌

Current Title: test: Add e2e tests for GPU ECC NPD health checks

Your PR title doesn't follow the expected format. Please update your PR title to follow one of these patterns:

Conventional Commits Format:

• feat: add new feature - for new features
• fix: resolve bug in component - for bug fixes
• docs: update README - for documentation changes
• refactor: improve code structure - for refactoring
• test: add unit tests - for test additions
• chore: remove dead code - for maintenance tasks
• chore(deps): update dependencies - for updating dependencies
• ci: update build pipeline - for CI/CD changes

Guidelines:

• Use lowercase for the type and description
• Keep the description concise but descriptive
• Use imperative mood (e.g., "add" not "adds" or "added")
• Don't end with a period

Examples:

• ✅ feat(windows): add secure TLS bootstrapping for Windows nodes
• ✅ fix: resolve kubelet certificate rotation issue
• ✅ docs: update installation guide
• ❌ Added new feature
• ❌ Fix bug.
• ❌ Update docs

Please update your PR title and the lint check will run again automatically.

[Copilot]

Pull request overview

Adds new e2e validators to exercise the GPU ECC Node Problem Detector (NPD) custom plugin on ECC-capable GPU SKUs, including validating the plugin config, the healthy condition state, and a fault-injection path.

Changes:

• Added validators to confirm the GPU ECC NPD plugin config file exists and that the healthy GPUECCError condition is reported.
• Added a fault-injection validator that temporarily replaces the ECC check script to force NPD to surface an error condition, then restores the original script.
• Wired the new validators into the existing runScenarioGPUNPD flow.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
e2e/validators.go	Adds GPU ECC NPD plugin/condition validators plus a fault-injection/restore flow.
e2e/test_helpers.go	Runs the new GPU ECC validators as part of the GPU NPD scenario.

---

You can also share your feedback on Copilot code review. Take the survey.