[core] add "custom_setup" tag to all python cgroup tests (#59231)

avoid adding more tags in `--except-tags` when using `custom_setup`
already

Signed-off-by: Lonnie Liu <lonnie@anyscale.com>
Signed-off-by: Lonnie Liu <95255098+aslonnie@users.noreply.github.com>

Author: aslonnie

.buildkite/core.rayci.yml

@@ -60,7 +60,7 @@ steps:
         --install-mask all-ray-libraries
         --workers "$${BUILDKITE_PARALLEL_JOB_COUNT}" --worker-id "$${BUILDKITE_PARALLEL_JOB}" --parallelism-per-worker 3
         --python-version 3.10 --build-name corebuild-py3.10
-        --except-tags custom_setup,cgroup
+        --except-tags custom_setup
         --install-mask all-ray-libraries
 
   - label: ":ray: core: python {{matrix.python}} tests ({{matrix.worker_id}})"
@@ -74,7 +74,8 @@ steps:
         --install-mask all-ray-libraries
         --workers 4 --worker-id "{{matrix.worker_id}}" --parallelism-per-worker 3
         --python-version {{matrix.python}} --build-name corebuild-py{{matrix.python}}
-        --except-tags custom_setup,cgroup
+        --except-tags custom_setup
+    depends_on: corebuild-multipy
     matrix:
       setup:
         python: ["3.12"]
@@ -103,7 +104,7 @@ steps:
         --install-mask all-ray-libraries
         --workers "$${BUILDKITE_PARALLEL_JOB_COUNT}" --worker-id "$${BUILDKITE_PARALLEL_JOB}" --parallelism-per-worker 3
         --test-env=TEST_EXTERNAL_REDIS=1
-        --except-tags custom_setup,cgroup
+        --except-tags custom_setup
         --python-version 3.10 --build-name corebuild-py3.10
 
   - label: ":ray: core: memory pressure tests"

python/ray/tests/resource_isolation/BUILD.bazel

@@ -15,6 +15,7 @@ py_test(
     srcs = ["test_resource_isolation_integration.py"],
     tags = [
         "cgroup",
+        "custom_setup",
         "exclusive",
         "no_windows",
         "team:core",
@@ -34,6 +35,7 @@ py_test(
     srcs = ["test_resource_isolation_config.py"],
     tags = [
         "cgroup",
+        "custom_setup",
         "exclusive",
         "no_windows",
         "team:core",