DEV: Change to show failed tests only Ember tests (#14335)

DEV: Change to show failed tests only Ember tests (#14335)

This commit sets tap_failed_tests_only to true in our testem config, so now only the failing tests will show in our GitHub CI Ember test runs, which saves developers from having to hunt through all of the passing tests using GitHub’s janky console output scrollback.

diff --git a/app/assets/javascripts/discourse/testem.js b/app/assets/javascripts/discourse/testem.js
index 00a1232..9a69697 100644
--- a/app/assets/javascripts/discourse/testem.js
+++ b/app/assets/javascripts/discourse/testem.js
@@ -3,6 +3,7 @@ module.exports = {
   disable_watching: true,
   launch_in_ci: ["Chrome", "Firefox", "Headless Firefox"], // Firefox is old ESR version, Headless Firefox is up-to-date evergreen version
   launch_in_dev: ["Chrome"],
+  tap_failed_tests_only: true,
   parallel: 1, // disable parallel tests for stability
   browser_args: {
     Chrome: [

GitHub sha: f6afcdf8a83be9fa8ba428f53f226b30d0af3cf6

This commit appears in #14335 which was approved by eviltrout. It was merged by martin.