DEV: Change QUnit reporters to dot (#26360)

This is so the CI output on GitHub actions isn't showing
tons and tons of unnecessary log data every time you want
to see the important thing, which is the actual test failure.

lib/tasks/qunit.rake

@@ -132,6 +132,7 @@ task "qunit:test", %i[timeout qunit_path filter] do |_, args|
       cmd += ["--load-balance", "--parallel", parallel] if parallel
       cmd += ["--filter", filter] if filter
       cmd << "--write-execution-file" if ENV["QUNIT_WRITE_EXECUTION_FILE"]
+      cmd << "--reporter=#{ENV["QUNIT_REPORTER_FORMAT"]}" if ENV["QUNIT_REPORTER_FORMAT"]
     end
 
     # Print out all env for debugging purposes