Switch most remaining extensions to use esbuild

Just 3 left:

- git and github. These are doing weird stuff with d.ts imports and const enums

- github-authentication  which has some tricky path mapping stuff

extensions/git-base/.vscodeignore

@@ -1,7 +1,6 @@
 src/**
 build/**
 cgmanifest.json
-extension.webpack.config.js
-extension-browser.webpack.config.js
+esbuild*.mts
 tsconfig*.json