fix(ci): exclude k8s/live from auto-collection to unblock Providers Tests (k8s) job

The parallel ci-tests-providers target passes -m "not serial" to filter
out tests that require a live cluster.  tests/providers/k8s/live/conftest.py
registers a pytest_collection_modifyitems hook that stamps the serial marker
on every item in the session — not just items under live/ — so when pytest
descends into that directory the entire 1261-item collection gets marked
serial and -m "not serial" deselects all of them → exit code 5 (no tests
ran).

Fix 1 (primary): add tests/providers/k8s/live to pyproject.toml
norecursedirs, mirroring the existing tests/providers/aws/live entry.
This prevents pytest from descending into live/ during the parallel leg.
The serial ci-tests-providers-serial target points pytest at the path
explicitly so live tests remain reachable when --run-k8s is passed.

Fix 2 (defensive): scope the pytest_collection_modifyitems hook in
live/conftest.py to items whose path is under the live/ directory.
This ensures that if the directory is ever included in a broader
collection again the hook cannot silently poison non-live tests.

Verified locally: 1217 items collected, 1214 passed, 3 pre-existing
failures in statefulset_handler and coverage_gaps tests unrelated to
this change.

Author: fgogolli

pyproject.toml

@@ -476,6 +476,15 @@ include-package-data = true
 testpaths = ["tests", "src/orb/k8s_legacy/tests"]
 norecursedirs = [
     "tests/providers/aws/live",
+    # k8s live tests require a real cluster; the parallel ci-tests-providers
+    # target passes -m "not serial" which would deselect every test if
+    # live/conftest.py's pytest_collection_modifyitems hook is allowed to run
+    # (it bulk-stamps serial on all collected items in the session).  Excluding
+    # this subtree from auto-discovery mirrors the aws/live pattern and keeps
+    # the parallel leg collecting only the mocked/unit/contract tests.  The
+    # serial ci-tests-providers-serial target points pytest at the path
+    # explicitly so live tests are still reachable when --run-k8s is passed.
+    "tests/providers/k8s/live",
     # Legacy k8s regression tests require a live cluster + kubeconfig; their
     # conftest calls `delete_pods_in_namespace()` at collection time, which
     # crashes in headless CI without a real kube context.  Run them

tests/providers/k8s/live/conftest.py

@@ -28,15 +28,26 @@
 
 
 def pytest_collection_modifyitems(config: pytest.Config, items: list[pytest.Item]) -> None:
-    """Apply the ``serial`` marker to every test collected in this subtree.
+    """Apply the ``serial`` marker to tests collected in this subtree.
+
+    The hook is scoped to items whose node-id starts with this directory so
+    that it does not accidentally mark tests from other directories (e.g.
+    unit/, mocked/, contract/) as serial when pytest collects multiple paths
+    in a single invocation.  Without the path guard every test in the session
+    would receive the serial marker, causing -m "not serial" to deselect the
+    entire suite and producing a 0-item run.
 
     ``pytestmark`` at module level is not picked up by conftest-level
     discovery; the collection hook is the canonical place to bulk-apply
     markers across a directory subtree.
     """
+    import pathlib
+
+    live_dir = str(pathlib.Path(__file__).parent)
     marker = pytest.mark.serial
     for item in items:
-        item.add_marker(marker)
+        if str(item.fspath).startswith(live_dir):
+            item.add_marker(marker)
 
 
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