Imaging Add-On: specify which prereqs are required and optional for the files and scripts

Details from Mike:

* [Office Installer](
https://www.microsoft.com/en-us/download/details.aspx?id=49117) - optional
* [vDot Installers](
https://github.com/The-Virtual-Desktop-Team/Virtual-Desktop-Optimization-Tool/archive/refs/heads/main.zip) - optional
* [Teams Installer - Commercial](https://teams.microsoft.com/downloads/desktopurl?env=production&plat=windows&arch=x64&managedInstaller=true&download=true) - optional
* [Teams Installer - DoD](https://dod.teams.microsoft.us/downloads/desktopurl?env=production&plat=windows&arch=x64&managedInstaller=true&download=true) - optional
* [Teams Installer - GCC](https://teams.microsoft.com/downloads/desktopurl?env=production&plat=windows&arch=x64&managedInstaller=true&ring=general_gcc&download=true) - optional
* [Teams Installer - GCCH](https://gov.teams.microsoft.us/downloads/desktopurl?env=production&plat=windows&arch=x64&managedInstaller=true&download=true) - optional
* [Microsoft Visual C++ Redistributable](
https://aka.ms/vs/16/release/vc_redist.x64.exe) - optional
* [Remote Desktop WebRTC Redirector Service](
https://aka.ms/msrdcwebrtcsvc/msi) - optional
* [ArcGIS Pro Installer - as Zip File](
https://pro.arcgis.com/en/pro-app/latest/get-started/download-arcgis-pro.htm) - optional

Start by locating the Imaging Add-On files and scripts referenced by this issue, then compare their actual prerequisites with the listed Office, vDot, Teams, Visual C++, WebRTC, and ArcGIS installers. Document which prerequisites are required versus optional for each file or script, and verify that the resulting list is unambiguous.

Written by the indexing model from the issue text.