Expose TargetVersion parameter in Build-Samples.ps1

Add a validated -TargetVersion parameter (also settable via the
WDS_TargetVersion environment variable) so samples can be built for older
target OS versions. Valid values come from the WDK DriverGeneral.xml rule
and default to the latest, Windows10:
  Windows10 (Windows 10 or higher), WindowsV6.3 (Windows 8.1),
  Windows8 (Windows 8), Windows7 (Windows 7).

The value is threaded through Build-SingleSample into the msbuild
invocation (replacing the hard-coded TargetVersion=Windows10) and across
the parallel runspace, and is surfaced in the build plan, final summary,
and HTML report title. Document the new parameter in the script help and
Building-Locally.md.

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

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