fix in kubernetes alpha backend support

Signed-off-by: David Festal <dfestal@redhat.com>

.changeset/tame-buttons-smell.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-kubernetes-backend': patch
+---
+
+Fixed wrong `pluginID` in the `kubernetes` alpha backend support, that made the `kubernetes` plugin fail with the new experimental backend.

plugins/kubernetes-backend/src/plugin.ts

@@ -28,7 +28,7 @@ import { KubernetesBuilder } from '@backstage/plugin-kubernetes-backend';
  * @alpha
  */
 export const kubernetesPlugin = createBackendPlugin({
-  pluginId: 'kubernetes-backend',
+  pluginId: 'kubernetes',
   register(env) {
     env.registerInit({
       deps: {