fix(ne-exec): allow no-more in managed NE CLI pipe whitelist

Support Huawei-style display ... | no-more alongside existing read-only pipe filters.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_ne_exec.py

@@ -45,6 +45,7 @@ class NeExecValidationTests(unittest.TestCase):
             "show run | match hostname",
             "show run | grep hostname",
             "show run | one-line",
+            "display current-configuration | no-more",
             "show run | include x | include y",
         ):
             with self.subTest(cmd=cmd):