Update Install FSLogix.ps1

[aaronparker]

• Updates code to use full PowerShell commands (not aliases) for better readability
• Simplifies code with use of variables to replace repeated path strings
• Fixes use of setting TLS (which was on the wrong line so it had no effect)
• Resolves the FSLogix aka.ms link before downloading it to ensure the download will be successful because no redirects are required
• Removes progress bars for Invoke-WebRequest and Expand-Archive for faster processing
• Updates the logic for finding the installer in the expanded zip file and installing the FSLogix agent
• Adds logging during the FSLogix agent install
• Removes the 'FSLogix Apps Online Help' shortcut created in the Start menu