[V0.11.0][Core] Restore scheduling logic under default configuration (#4094)

### What this PR does / why we need it?
Cherry-pick #3967 from main branch. This PR reverts the changes
introduced in PR #2894 Initially, due to performance issues with the
older version of the chunked prefill ops, the default behavior was to
use the Ascend scheduler to disable the chunked prefill feature.
However, with the improvements in the performance of the new chunked
prefill ops, this interception strategy has been removed. This change
also aligns with the community's default configuration behavior.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
CI passed with new added/existing test.

Signed-off-by: rjg-lyh <1318825571@qq.com>

tests/ut/test_platform.py

@@ -754,7 +754,7 @@ class TestNPUPlatform(TestBase):
             self.platform.check_and_update_config(VllmConfig)
             self.assertTrue(
                 "PIECEWISE compilation enabled on NPU. use_inductor not supported - "
-                "using only ACL Graph mode" in cm.output[1])
+                "using only ACL Graph mode" in cm.output[0])
             self.assertEqual(
                 VllmConfig.compilation_config.level,
                 CompilationLevel.PIECEWISE,