Enhancement: add kubernetes support to portainer widget (#5414)

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/widgets/portainer/widget.js

@@ -1,14 +1,23 @@
 import credentialedProxyHandler from "utils/proxy/handlers/credentialed";
 
 const widget = {
-  api: "{url}/api/endpoints/{env}/{endpoint}",
+  api: "{url}/api/{endpoint}",
   proxyHandler: credentialedProxyHandler,
 
   mappings: {
-    "docker/containers/json": {
-      endpoint: "docker/containers/json",
+    "docker/containers": {
+      endpoint: "endpoints/{env}/docker/containers/json",
       params: ["all"],
     },
+    "kubernetes/applications": {
+      endpoint: "kubernetes/{env}/applications/count",
+    },
+    "kubernetes/services": {
+      endpoint: "kubernetes/{env}/services/count",
+    },
+    "kubernetes/namespaces": {
+      endpoint: "kubernetes/{env}/namespaces/count",
+    },
   },
 };