Bug 1849432 - [devtools] Stop adding main.js bundle to the index.html file r=devtools-reviewers,perftest-reviewers,jdescottes,AlexandruIonescu

Differential Revision: https://phabricator.services.mozilla.com/D186602

testing/talos/talos/tests/devtools/addon/content/pages/custom/debugger/app-build/index.html

@@ -30,5 +30,5 @@
       eval("function evalScript() {} //# sourceURL=eval/eval-script-" + i +".js");
     }
   </script>
-<script type="text/javascript" src="./static/js/main.js"></script></body>
+</body>
 </html>

testing/talos/talos/tests/devtools/addon/content/pages/custom/debugger/app/config/webpack.config.prod.js

@@ -269,7 +269,7 @@ module.exports = {
     new InterpolateHtmlPlugin(env.raw),
     // Generates an `index.html` file with the <script> injected.
     new HtmlWebpackPlugin({
-      inject: true,
+      inject: false,
       template: paths.appHtml,
       minify: {
         removeComments: false,