integrate kubelet with the systemd watchdog

feat:  add unit test

feat:  add FeatureGate for SystemdWatchdog

fix:  linter and failed tests

feat:  add SystemdWatchdog to versioned feature list yaml

test/featuregates_linter/test_data/versioned_feature_list.yaml

@@ -1218,6 +1218,12 @@
     lockToDefault: false
     preRelease: Alpha
     version: "1.31"
+- name: SystemdWatchdog
+  versionedSpecs:
+  - default: true
+    lockToDefault: false
+    preRelease: Beta
+    version: "1.32"
 - name: TopologyAwareHints
   versionedSpecs:
   - default: false