Enable eks pytorch single node training test on mainline (#5246)

* do not skip eks test on mainline & remove redundant skip

Author: jinyan-li1

test/dlc_tests/eks/pytorch/training/test_eks_pytorch_training.py

@@ -18,10 +18,6 @@
 LOGGER = eks_utils.LOGGER
 
 
-@pytest.mark.skipif(
-    not is_pr_context(),
-    reason="Skip this test. It is already tested under PR context and we do not have enough resouces to test it again on mainline pipeline",
-)
 @pytest.mark.model("mnist")
 @pytest.mark.team("conda")
 def test_eks_pytorch_single_node_training(pytorch_training):
@@ -98,9 +94,6 @@ def test_eks_pytorch_single_node_training(pytorch_training):
         run("kubectl delete pods {}".format(pod_name))
 
 
-@pytest.mark.skipif(
-    not is_pr_context(), reason="Skip this test. It is already tested under PR context"
-)
 @pytest.mark.skip("DGL binaries are not installed in DLCs by default")
 @pytest.mark.integration("dgl")
 @pytest.mark.model("gcn")