docs: improve CI and testing documentation (#21202)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test/srt/run_suite.py

@@ -96,7 +96,7 @@ suite_ascend = {
         TestFile("ascend/test_ascend_tp1_bf16.py", 400),
         TestFile("ascend/test_ascend_compile_graph_tp1_bf16.py", 400),
         TestFile("ascend/test_ascend_w8a8_quantization.py", 400),
-        TestFile("test_embed_interpolate_unittest.py", 400),
+        TestFile("ascend/test_embed_interpolate_unittest.py", 400),
     ],
     "per-commit-2-npu-a2": [
         TestFile("ascend/test_ascend_graph_tp2_bf16.py", 400),
@@ -326,4 +326,9 @@ def main():
 
 
 if __name__ == "__main__":
+    print(
+        "DEPRECATION NOTICE: The folder `test/srt` should be deprecated as soon as possible. "
+        "Migrate tests to the new CI registry system described in `test/README.md`.",
+        flush=True,
+    )
     main()