Kubernetes plugin: UI revamp (#3918)

* initial revamp, no error reporting

* initial error detection

* more error detection

* add microsite page

* minor fixes

* add HPA error detection

* refactor error reporting; add tests

* fix import

* add changeseet

* empty error state

* prettier yaml file

* Update plugins/kubernetes/src/components/KubernetesDrawer/KubernetesDrawer.tsx

Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>

* Update plugins/kubernetes/src/components/KubernetesDrawer/KubernetesDrawer.tsx

Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>

* PR feedback

* revert odd change

* make patch change

* fix test

* Apply suggestions from code review

Co-authored-by: Fredrik Adelöw <freben@gmail.com>

* prettier

* pr feedback

Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>
Co-authored-by: Fredrik Adelöw <freben@gmail.com>

microsite/sidebars.json

@@ -50,6 +50,7 @@
           "features/software-catalog/well-known-relations",
           "features/software-catalog/extending-the-model",
           "features/software-catalog/external-integrations",
+          "features/software-catalog/kubernetes-in-backstage",
           "features/software-catalog/software-catalog-api"
         ]
       },