Move ignore logs from TC to conftest for sub ports suite (#6175)

PR #5951 introduced 2 error log ignore while running sub_port_interfaces test suite. Sub port folder has 2 more cases that need those skip to be performed

What is the motivation for this PR?
Enable ignore for all sub port test suite

How did you do it?
Move ignore fixture from test to conftest scope

How did you verify/test it?
Run TC, all passed

tests/sub_port_interfaces/conftest.py

@@ -591,3 +591,12 @@ def teardown_test_class(duthost):
     """
     yield
     config_reload(duthost)
+
+@pytest.fixture(autouse=True)
+def ignore_expected_loganalyzer_exception(duthost, loganalyzer):
+    if loganalyzer and loganalyzer[duthost.hostname]:
+        ignore_regex_list = [
+            ".*ERR teamd[0-9]*#tlm_teamd.*process_add_queue: Can't connect to teamd after.*attempts. LAG 'PortChannel.*'",
+            ".*ERR swss[0-9]*#orchagent.*update: Failed to get port by bridge port ID.*"
+        ]
+        loganalyzer[duthost.hostname].ignore_regex.extend(ignore_regex_list)

tests/sub_port_interfaces/test_sub_port_interfaces.py

@@ -477,12 +477,3 @@ def test_balancing_sub_ports(self, duthost, ptfhost, ptfadapter, apply_balancing
                                         type_of_traffic='balancing',
                                         ttl=63)
 
-
-@pytest.fixture(autouse=True)
-def ignore_expected_loganalyzer_exception(duthost, loganalyzer):
-    if loganalyzer and loganalyzer[duthost.hostname]:
-        ignore_regex_list = [
-            ".*ERR teamd[0-9]*#tlm_teamd.*process_add_queue: Can't connect to teamd after.*attempts. LAG 'PortChannel.*'",
-            ".*ERR swss[0-9]*#orchagent.*update: Failed to get port by bridge port ID.*"
-        ]
-        loganalyzer[duthost.hostname].ignore_regex.extend(ignore_regex_list)