UPSTREAM: <carry>: OCPBUGS-84961: backport kubernetes/conformance umbrella suite

Backport the kubernetes/conformance suite with Conformance label filter
from master (PRs #2682 and #2694 combined). The suite provides the minimal
true upstream Kubernetes conformance tests used by OPCT for VCSP
validations.

Without this fix, running openshift-tests run kubernetes/conformance on
4.22 returns 'suite not found'. With this fix, the suite correctly selects
only [Conformance]-labeled tests (~428 tests).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: bshaw7

openshift-hack/cmd/k8s-tests-ext/k8s-tests.go

@@ -70,6 +70,14 @@ func main() {
 		Qualifiers: []string{withExcludedTestsFilter(`(name.contains('[Serial]') || labels.exists(l, l == '[Serial]')) && labels.exists(l, l == "Conformance")`)},
 	})
 
+	// kubernetes/conformance is used by OPCT to run the minimal true upstream
+	// Kubernetes conformance tests, not the broader view OCP takes of what
+	// "conformance" means.
+	kubeTestsExtension.AddSuite(e.Suite{
+		Name:       "kubernetes/conformance",
+		Qualifiers: []string{withExcludedTestsFilter(`labels.exists(l, l == "Conformance")`)},
+	})
+
 	kubeTestsExtension.AddSuite(e.Suite{
 		Name: "kubernetes/conformance/parallel",
 		Parents: []string{