The `asWebviewUri` methods was introduced in VS Code 1.38. It's silly that we still force every single webview to pay the cost of trying to rewrite the old style uris we supported in very old versions of VS Code
Instead I've moved this logic into the extension host and disabled it for all extensions that target VS Code 1.60+ or newer. This means it never applies to internal webviews, notebooks, webview views, or custom editors (these public apis were all introduced after the switch to `asWebviewUri`)
