Bug 1594963 - Add do_report_result to XPCShell test globals. r=Standard8

Differential Revision: https://phabricator.services.mozilla.com/D52298

--HG--
extra : moz-landing-system : lando

tools/lint/eslint/eslint-plugin-mozilla/lib/configs/xpcshell-test.js

@@ -25,6 +25,7 @@ module.exports = {
     do_load_module: false,
     do_note_exception: false,
     do_parse_document: false,
+    do_report_result: false,
     do_report_unexpected_exception: false,
     do_send_remote_message: false,
     do_test_finished: false,