Use PNG instead of .SVG files as VS Code now fails if you try to use svg files

This change was for security purposes on vscode's end.
It was breaking our code. I used the url on vsmarketplace as it should be a stable url, even if the version changes.

vscode-dotnet-runtime-extension/README.md

@@ -1,6 +1,6 @@
 # .NET Install Tool for Extension Authors
 
-[![Version](https://vsmarketplacebadge.apphb.com/version/ms-dotnettools.vscode-dotnet-runtime.svg)](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-runtime) [![Installs](https://vsmarketplacebadge.apphb.com/installs-short/ms-dotnettools.vscode-dotnet-runtime.svg)](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-runtime)
+[![Version](https://ms-dotnettools.gallerycdn.vsassets.io/extensions/ms-dotnettools/vscode-dotnet-runtime/1.6.0/1667237254317/Microsoft.VisualStudio.Services.Icons.Default)](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-runtime) [![Installs](https://ms-dotnettools.gallerycdn.vsassets.io/extensions/ms-dotnettools/vscode-dotnet-runtime/1.6.0/1667237254317/Microsoft.VisualStudio.Services.Icons.Default)](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-runtime)
 
 This extension allows acquisition of the .NET runtime specifically for Visual Studio Code extension authors. This tool is intended to be leveraged in extensions that are written in .NET and require .NET to boot pieces of the extension (e.g. a language server). The extension is not intended to be used directly by users to install .NET for development.
 

vscode-dotnet-sdk-extension/README.md

@@ -1,6 +1,6 @@
 # .NET Education Bundle SDK Install Tool
 
-[![Version](https://vsmarketplacebadge.apphb.com/version/ms-dotnettools.vscode-dotnet-sdk.svg)](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-sdk) [![Installs](https://vsmarketplacebadge.apphb.com/installs-short/ms-dotnettools.vscode-dotnet-sdk.svg)](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-sdk)
+[![Version](https://ms-dotnettools.gallerycdn.vsassets.io/extensions/ms-dotnettools/vscode-dotnet-runtime/1.6.0/1667237254317/Microsoft.VisualStudio.Services.Icons.Default)](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-sdk) [![Installs](https://ms-dotnettools.gallerycdn.vsassets.io/extensions/ms-dotnettools/vscode-dotnet-runtime/1.6.0/1667237254317/Microsoft.VisualStudio.Services.Icons.Default)](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-sdk)
 
 **Note: This is a very early preview of this tool and is not intended for use outside the .NET education bundle. Using this in other scenarios will result in broken installs on user machines due to conflict with the normal SDK installer.**