[ty] Synthesize a `_replace` method for NamedTuples #22153

Performance Gate Passed

✅ 13 untouched
⏩ 39 skipped¹
🗄️ 9 archived benchmarks run²

39 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
9 benchmarks were run, but are now archived. If they were deleted in another branch, consider rebasing to remove them from the report. Instead if they were added back, click here to restore them. ↩