Revert "Remove unnecessary build_app calls in configuration tests"

This reverts commit 1ffef67.

Those are necessary because setup calls `suppress_default_config`
which moves the config/environments/* files. This is very confusing
so maybe we should change the setup to not move those files.

Author: rafaelfranca

railties/test/application/configuration_test.rb

@@ -1911,6 +1911,8 @@ def index
     end
 
     test "config.active_record.dump_schema_after_migration is false on production" do
+      build_app
+
       app "production"
 
       assert_not ActiveRecord.dump_schema_after_migration
@@ -3030,12 +3032,14 @@ class ::DummySerializer < ActiveJob::Serializers::ObjectSerializer; end
     end
 
     test "config.active_job.verbose_enqueue_logs defaults to true in development" do
+      build_app
       app "development"
 
       assert ActiveJob.verbose_enqueue_logs
     end
 
     test "config.active_job.verbose_enqueue_logs defaults to false in production" do
+      build_app
       app "production"
 
       assert_not ActiveJob.verbose_enqueue_logs