Migrate IPMIUtil and Windows ETW monitors to open source

[AlexWFMS]

Summary

• migrate the IPMIUtil sensor and SEL monitors, parsers, and existing unit tests/resources from the internal extension repository
• migrate the Windows ETW monitor as WindowsETWMonitor with its existing unit tests
• document self-contained custom profile examples for both monitor families without adding bundled public profiles
• advance the public package version to 3.5.8

Validation

• migrated monitor unit tests: 181 passed, 2 skipped (pre-existing elevation-dependent ETW tests)
• Docusaurus production build passed using the approved Microsoft npm feed
• win-x64 and win-arm64 public publishes passed for the ETW migration
• live Windows x64 ETW A/B validation against the detached internal baseline passed on the same VM:
  • kernel scenario: both builds exited 0 and emitted the same 28-field schema
  • combined scenario: both builds emitted 28 kernel and 6 .NET runtime events
• git diff --check passed

Migration notes

• no public ETW, IPMIUtil, or Azure Host profiles are added; component usage and dependency examples are documented instead
• no ETW workload package or generator exists; the TraceEvent dependency was already present in the public repository
• the IPMIUtil Windows package is host.monitors.1.0.1.zip; package transfer proof is tracked with the coordinated internal migration work
• runtime behavior was preserved; inherited monitor improvements should be handled separately
• coordinated internal cleanup must consume VirtualClient.* 3.5.8-beta and merge only after that public package is available

[azure-pipelines]

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