Update conditional check to install poetry for PowerShell

[gurashish1singh]

if [[ $(command -v poetry) ]]; then

The above conditional to check if poetry is installed to the user's path in the shell script, setup.sh only works for GitBash and Unix-like terminals. This check does not work on PowerShell.

Furthermore, poetry installation fails due to a ModuleNotFoundError:

AC:

• Update the conditional to check if poetry is already installed to be successful on PowerShell
• Fix the ModuleNotFoundError (full error stack attached)

poetry-installer-error-xodgg7gb.log