[CI][Omni-DuplexEval] Add nightly scoring CI guard (#7773)

Signed-off-by: RyanYun09 <318555231+RyanYun09@users.noreply.github.com>

.gitignore

@@ -245,6 +245,8 @@ datasets/
 !recipes/cosmos3/negative_prompt.json
 !tests/dfx/perf/tests/*.json
 !apps/ComfyUI-vLLM-Omni/example_workflows/*.json
+# Omni-DuplexEval CI config JSON (e.g. accuracy/omni_duplex_eval)
+!tests/e2e/accuracy/omni_duplex_eval/*.json
 *.jsonl
 *.parquet