The Test-PowerShellModuleExist function is irrelevant and should be removed

Brief description of your issue

PowerShell provides a native way to check for required modules and a separate function isn't needed as documented here:

https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_requires?view=powershell-7.4#-modules-module-name--hashtable
The entire test logic for the modules can be replaced by the single line:

#Requires -Modules Az.Resources, Az.Accounts, Az.Websites, Az.Functions, Az.Storage

This line can be placed anywhere in the script, but goes into the begin block by convention.

I will improve the script be bringing it inline with PowerShell standards and making it quicker to error when the modules are not present.

Steps to reproduce

Remove the module test logic and replace with the single line above

Expected behavior

the module cannot be loaded without the modules being present

Actual behavior

module loads, but fails on initial run.

Environment

N/A

Locate the PowerShell script containing Test-PowerShellModuleExist and read its module-loading and begin-block logic. Replace the existing module test as described in the issue, then verify that the script fails immediately when the required modules are unavailable and loads when they are present.