Fix Windows Helix work item exit code and prerequisite error handling #5075
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Use 'call deactivate' instead of 'deactivate' in PostCommands on Windows. Without 'call', the batch file transfers control to deactivate.bat and never returns, causing EXIT /b %_commandExitCode% to never execute.
Chain Windows prerequisite install commands with && and add error checking. Previously, pip install failures were silently ignored, causing ModuleNotFoundError for azure packages during upload.