refactor: consolidate VS detection into Resolve-BuildEnvironment

- Remove Initialize-DevShell as a separate step; VS Dev Shell setup is
  now fully owned by Resolve-BuildEnvironment alongside mode detection.
  This eliminates the ordering problem where vswhere ran unconditionally
  before knowing whether the environment was EWDK (which needs no VS).

- Fix EWDK regression: EWDK mode now returns early before any vswhere
  or Dev Shell logic is invoked.

- Fix Auto+WDK from plain terminal: the old isWdk guard required
  UCRTVersion to be set before the Dev Shell was opened, making Auto
  detection fail on a clean terminal. Removed the guard; the code now
  falls through to Dev Shell setup and validates UCRTVersion afterward.

- Fix VSINSTALLDIR trailing-backslash mismatch: when the Dev Shell is
  already active, VSINSTALLDIR ends with '\' while vswhere installationPath
  does not. Added TrimEnd('\') on both sides before comparing.

- Renumber Build-Samples.ps1 step comments (old Step 5 'Detect Build
  Environment' merged into Step 1; remaining steps renumbered).

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

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