Include explicit list of modules to avoid gathering telemetry for.

`fetch/ajax` throws an error when its required, no need to emit a
warning for this module, since it contains no code.

Author: Robert Jackson

lib/gather-telemetry.js

@@ -9,13 +9,17 @@ module.exports = async function gatherTelemetry(url) {
 
   // Get the "viewport" of the page, as reported by the page.
   const telemetry = await page.evaluate(() => {
+    const SKIPPED_MODULES = ["fetch/ajax"];
+
     /* globals window, Ember */
     let telemetry = {};
 
     const modules = Object.keys(window.require.entries);
 
     for (let modulePath of modules) {
-      let module = require(modulePath);
+      if (SKIPPED_MODULES.includes(modulePath)) {
+        continue;
+      }
 
       try {
         let module = require(modulePath);