Refactor Build-Samples.ps1 and fix ListAllSamples NuGet filter

Build-Samples.ps1:
- Extract helper functions for readability (Resolve-BuildEnvironment,
  Import-SampleExclusions, Initialize-DevShell, Assert-MsBuildAvailable,
  Get-DiskFreeGB)
- Add #Requires -Version 7.0
- Fix build_number to explicit [int] cast (was string from regex)
- Fix multi-socket CPU handling (sum LogicalProcessors)
- Fix NuGet path detection to use absolute repo root path
- Support wildcard patterns in exclusion paths (-like vs ContainsKey)
- Guard Invoke-Item for CI/automation (skip in non-interactive sessions)
- Validate sample directories exist before building
- Wrap Get-Volume in try/catch for UNC/network drives
- Use Write-Host with carriage return for progress (Write-Progress
  unreliable in -Parallel runspaces)
- Clean up variable names and add section comments
- Use switch instead of if/elseif for exit codes

ListAllSamples.ps1:
- Fix NuGet packages filter regex to catch packages anywhere in path
  (was only matching paths starting with packages)

Samples.txt:
- Regenerated with fixed filter, remove BOM

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

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