Auto-discover _NT_TARGET_VERSION; remove the TargetVersion axis

- Remove the -TargetVersion parameter and all its plumbing from Build-Samples.ps1 (restoring
  the original hard-coded -p:TargetVersion=Windows10), and drop the TargetVersions column from
  exclusions.csv and Import-SampleExclusions. Only _NT_TARGET_VERSION remains exposed.
- Add Get-NtTargetVersions.ps1, which auto-discovers the valid _NT_TARGET_VERSION values (and
  their NTDDI codes) by parsing the active WDK's DriverGeneral.xml rule. Build-Samples.ps1 uses
  it to validate -NtTargetVersion, default to the latest, and map to the msbuild code, so a new
  WDK version needs no script change (accepts '10.0.<build>' or the short '<build>' tag).
- CI: ci.yml and ci-pr.yml gain a 'discover' job that emits the newest-N versions as JSON; the
  build matrix consumes it via fromJSON, so there is no hand-maintained version list anywhere.
  Build-ChangedSamples.ps1 treats Get-NtTargetVersions.ps1 as a full-build trigger.
- Docs updated accordingly.

Co-authored-by: Copilot <[email protected]>

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