Support TargetVersion-scoped rules in exclusions.csv

Add an optional TargetVersions column to exclusions.csv so an exclusion can
be limited to specific target OS versions (e.g. exclude ARM only when
building Windows8). The column holds a ';'-separated list of -like patterns
matched against -TargetVersion; blank or '*' means all versions, so every
existing row stays applicable to all targets.

Import-SampleExclusions now takes -TargetVersion and filters rows by it at
load time (alongside the existing MinBuild/MaxBuild range); a missing column
is treated as '*' for backward compatibility. Document the new column and an
example in Building-Locally.md.

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

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