Load correct JS for the active Bootstrap version (#18120)

* Load correct JS for the active Bootstrap version

* Tidy up bootstrapVersion declaration

* Add Bootstrap JS to website redesign layout

* FIx error on interstitial subscriptions page

* Remove unnecessary import of jQuery and Bootstrap

* Use global entrypointScripts in bootstrap-js mixin

GitOrigin-RevId: 6b1977354a72dc69008fc0d2e3baec2f28d97f6b

services/web/webpack.config.js

@@ -17,6 +17,8 @@ invalidateBabelCacheIfNeeded()
 // Generate a hash of entry points, including modules
 const entryPoints = {
   tracing: './frontend/js/tracing.js',
+  'bootstrap-3': './frontend/js/bootstrap-3.ts',
+  'bootstrap-5': './frontend/js/bootstrap-5.ts',
   devToolbar: './frontend/js/dev-toolbar.js',
   main: './frontend/js/main.js',
   ide: './frontend/js/ide.js',