code_utils.py powershell command bugfix in MacOS (#1963)

* macos bugfix

* logs permissionerror warning only if lang is powershell command

* condensed the if statements down

* Update code_utils.py

* fixed formatting

* handled powershell_command = None case

* bugfix

* raising exceptions instead of logging warnings

* code formatting fixed

* removed return sh statement

* fixed code formatting

* update get_powershell_command

* Update code_utils.py

fixed code format

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Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>