[Refactor][CI] Reorganize test tree, and move slow e2e to weekly (#4951)

Signed-off-by: wangyu <410167048@qq.com>

tools/nightly/buildkite_testcase_statistics.py

@@ -903,11 +903,11 @@ def _sample_preview_stats() -> list[tuple]:
             "test-ready",
             None,
             "Custom Pipeline Test",
-            ["tests/e2e/offline_inference/custom_pipeline/test_cp.py"],
+            ["tests/e2e/features/custom_pipeline/test_cp.py"],
             False,
             [],
             1,
-            ["tests/e2e/offline_inference/custom_pipeline/test_cp.py::test_cp_one"],
+            ["tests/e2e/features/custom_pipeline/test_cp.py::test_cp_one"],
             [""],
             set(),
         ),