feat(helm): Enable PreStop hook configuration in values.yaml (#19613)

deploy/charts/litellm-helm/values.yaml

@@ -234,6 +234,14 @@ db:
   #  instance.  See the "postgresql" top level key for additional configuration.
   deployStandalone: true
 
+# Lifecycle hooks for the LiteLLM container
+# Example:
+# lifecycle:
+#   preStop:
+#     exec:
+#       command: ["/bin/sh", "-c", "sleep 10"]
+lifecycle: {}
+
 # Settings for Bitnami postgresql chart (if db.deployStandalone is true, ignored
 #  otherwise)
 postgresql: