feat: hardware-health fetch non sensor data metrics

[yoks]

Description

Right now HW health only fetches sensor backed data, but some metrics are explosed as scalar or other values via Metrics endpoint.

This PR adds support for all default metrics. Next steps would be to add OEM metrics support (as soon as they added to nv-redfish).

PR refactors discovery to separate task which uses ArcSwap to share data between collectors. Metrics collector would be disabled by default for now.

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Related Issues (Optional)

#2283

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

Additional Notes

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[github-actions]

🌿 Preview your docs: https://nvidia-preview-pull-request-2433.docs.buildwithfern.com/infra-controller

[zhaozhongn]

Would this further increase the BMC workload and potentially degrade its performance for DPS use case?