test: skip flaky hotplug tests on 5.10 hosts

test_virtio_mem_hotplug_hotunplug and test_memory_hotplug_latency
intermittently fail on 5.10 hosts, where the GET /hotplug/memory API
call exceeds the maximum duration assertion. Skip both on 5.10 hosts
until the latency is investigated.

Signed-off-by: Jay Chung <jaehoc@amazon.com>

Author: not4s

tests/integration_tests/performance/test_hotplug_memory.py

@@ -252,6 +252,10 @@ def check_hotunplug(uvm, requested_size_mib):
         assert rss_after < rss_before, "RSS didn't decrease"
 
 
+@pytest.mark.skipif(
+    global_props.host_linux_version_tpl == (5, 10),
+    reason="GET /hotplug/memory intermittently exceeds the duration threshold on 5.10 hosts",
+)
 def test_virtio_mem_hotplug_hotunplug(uvm_any_memhp):
     """
     Check that memory can be hotplugged into the VM.
@@ -456,6 +460,10 @@ def timed_memory_hotplug(uvm, size, metrics, metric_prefix, fc_metric_name):
     )
 
 
+@pytest.mark.skipif(
+    global_props.host_linux_version_tpl == (5, 10),
+    reason="GET /hotplug/memory intermittently exceeds the duration threshold on 5.10 hosts",
+)
 @pytest.mark.nonci
 @pytest.mark.parametrize(
     "hotplug_size",