skip test_gcu_acl_dhcp_rule_creation for isolated topology (sonic-net#20187)

What is the motivation for this PR?
Skip DHCP test case in test_dynamic_acl.py

How did you do it?
skip it in conditional marker.

How did you verify/test it?
run in local test testbed.

Signed-off-by: Guy Shemesh <[email protected]>

Author: sdszhang

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -1531,6 +1531,12 @@ generic_config_updater/test_dynamic_acl.py:
       - "topo_name in ['m0-2vlan']"
       - "platform in ['x86_64-8101_32fh_o-r0', 'x86_64-8102_64h_o-r0', 'x86_64-8101_32fh_o_c01-r0']"
 
+generic_config_updater/test_dynamic_acl.py::test_gcu_acl_dhcp_rule_creation:
+  skip:
+    reason: "DHCP is not enabled in isolated topo"
+    conditions:
+      - "'t0-isolated' in topo_name"
+
 generic_config_updater/test_ecn_config_update.py::test_ecn_config_updates:
   skip:
     reason: "This test is not run on this asic type, topology, or version currently"