chore: migrate kube feature RelaxedEnvironmentVariableValidation to new versioned kube feature file and syntax

pkg/features/kube_features.go

@@ -1144,8 +1144,6 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 
 	RecoverVolumeExpansionFailure: {Default: false, PreRelease: featuregate.Alpha},
 
-	RelaxedEnvironmentVariableValidation: {Default: false, PreRelease: featuregate.Alpha},
-
 	ReloadKubeletServerCertificateFile: {Default: true, PreRelease: featuregate.Beta},
 
 	ResourceHealthStatus: {Default: false, PreRelease: featuregate.Alpha},

pkg/features/versioned_kube_features.go

@@ -17,6 +17,7 @@ limitations under the License.
 package features
 
 import (
+	"k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/component-base/featuregate"
 )
 
@@ -27,8 +28,7 @@ import (
 // Entries are separated from each other with blank lines to avoid sweeping gofmt changes
 // when adding or removing one entry.
 var defaultVersionedKubernetesFeatureGates = map[featuregate.Feature]featuregate.VersionedSpecs{
-	// Example:
-	// genericfeatures.EmulationVersion: {
-	// 	{Version: version.MustParse("1.30"), Default: false, PreRelease: featuregate.Alpha},
-	// },
+	RelaxedEnvironmentVariableValidation: {
+		{Version: version.MustParse("1.30"), Default: false, PreRelease: featuregate.Alpha},
+	},
 }

test/featuregates_linter/test_data/unversioned_feature_list.yaml

@@ -628,12 +628,6 @@
     lockToDefault: false
     preRelease: Beta
     version: ""
-- name: RelaxedEnvironmentVariableValidation
-  versionedSpecs:
-  - default: false
-    lockToDefault: false
-    preRelease: Alpha
-    version: ""
 - name: ReloadKubeletServerCertificateFile
   versionedSpecs:
   - default: true

test/featuregates_linter/test_data/versioned_feature_list.yaml

@@ -1 +1,6 @@
-[]
+- name: RelaxedEnvironmentVariableValidation
+  versionedSpecs:
+  - default: false
+    lockToDefault: false
+    preRelease: Alpha
+    version: "1.30"