[Windows] Deprecate Windows 2019 runner

Author: akilesh-amaran

CONTRIBUTING.md

@@ -34,6 +34,7 @@ Here are a few things you can do that will increase the likelihood of your pull
 
 - For every new tool, add validation scripts and update the software report script to ensure that it is included in the documentation.
 - If the tool is available on multiple platforms (macOS, Windows, Linux), make sure you include it on as many as possible.
+- If installing multiple versions of the tool, consider putting the list of versions in the corresponding `toolset.json` file. This will help other customers configure their builds flexibly. See [toolset-windows-2022.json](images/windows/toolsets/toolset-2022.json) as an example.
 - Use consistent naming across all files.
 - Validation scripts should be simple and shouldn't change the image content.
 
@@ -44,6 +45,7 @@ There are a bunch of helper functions that could simplify your code: `Install-Ch
 - Add a script that will validate the tool installation and put the script in the `scripts/tests` folder.
 We use [Pester v5](https://github.com/pester/pester) for validation scripts. If the tests for the tool are complex enough, create a separate `*.Tests.ps1`. Otherwise, use `Tools.Tests.ps1` for simple tests.
 Add `Invoke-PesterTests -TestFile <testFileName> [-TestName <describeName>]` at the end of the installation script to ensure that your tests will be run.
+- Add changes to the software report generator `images/windows/scripts/docs-gen/Generate-SoftwareReport.ps1`. The software report generator is used to generate an image's README file, e.g. [Windows2022-Readme.md](images/windows/Windows2022-Readme.md) and uses [MarkdownPS](https://github.com/Sarafian/MarkdownPS).
 
 ### Ubuntu
 

docs/create-image-and-azure-resources.md

@@ -1,6 +1,6 @@
 # GitHub Actions Runner Images
 
-The runner-images project uses [Packer](https://www.packer.io/) to generate disk images for Windows 2022 and Ubuntu 22.04/24.04.
+The runner-images project uses [Packer](https://www.packer.io/) to generate disk images for Windows 2022/2025 and Ubuntu 22.04/24.04.
 
 Each image is configured by a HCL2 Packer template that specifies where to build the image (Azure, in this case),
 and what steps to run to install software and prepare the disk.

helpers/GenerateResourcesAndImage.ps1

@@ -1,11 +1,11 @@
 $ErrorActionPreference = 'Stop'
 
 enum ImageType {
-    Windows2022   = 2
-    Windows2025   = 3
-    Ubuntu2204    = 4
-    Ubuntu2404    = 5
-    UbuntuMinimal = 6
+    Windows2022   = 1
+    Windows2025   = 2
+    Ubuntu2204    = 3
+    Ubuntu2404    = 4
+    UbuntuMinimal = 5
 }
 
 Function Get-PackerTemplatePath {