Fix laganalyzer error in test_iface_namingmode (sonic-net#16073)

Similar issue to sonic-net#12174 in that counters
stats continue to be polled in an unstable state.  In the test_iface_namingmode.py
case, TestConfigInterface resets the interface configurations at the end, and these
syslog errors only appear after the test begins the teardown process.

Adding a loganalyzer ignore for this message to this test to fix.

Author: veronica-arista

tests/iface_namingmode/test_iface_namingmode.py

@@ -26,6 +26,16 @@ def skip_test_for_multi_asic(duthosts, enum_rand_one_per_hwsku_frontend_hostname
         pytest.skip('CLI command not supported')
 
 
+@pytest.fixture(autouse=True)
+def ignore_expected_loganalyzer_exception(duthosts, enum_rand_one_per_hwsku_frontend_hostname, loganalyzer):
+    if loganalyzer:
+        ignore_regex_list = [
+            ".* ERR syncd#syncd: :- collectData: Failed to get stats of Port Counter.*"
+        ]
+        duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
+        loganalyzer[duthost.hostname].ignore_regex.extend(ignore_regex_list)
+
+
 @pytest.fixture(scope='module', autouse=True)
 def setup(duthosts, enum_rand_one_per_hwsku_frontend_hostname, tbinfo):
     """