kubernetes-plugin: integrate with top method from kubernetes client library (#8248)

* kubernetes-plugin: integrate with top method from kubernetes client library

Signed-off-by: mclarke <mclarke@spotify.com>

* fix existing tests

Signed-off-by: mclarke <mclarke@spotify.com>

* prettier

Signed-off-by: mclarke <mclarke@spotify.com>

* add fetcher test

Signed-off-by: mclarke <mclarke@spotify.com>

* update api report

Signed-off-by: mclarke <mclarke@spotify.com>

* fix fe tests

Signed-off-by: mclarke <mclarke@spotify.com>

* fe tests

Signed-off-by: mclarke <mclarke@spotify.com>

* changeset

Signed-off-by: mclarke <mclarke@spotify.com>

* add skip metrics lookup flag

Signed-off-by: mclarke <mclarke@spotify.com>

* add skip metrics lookup to gke locator and docs

Signed-off-by: mclarke <mclarke@spotify.com>

* fix tests

Signed-off-by: mclarke <mclarke@spotify.com>

* minor change

Signed-off-by: mclarke <mclarke@spotify.com>

* missed prettier

Signed-off-by: mclarke <mclarke@spotify.com>

* missed file

Signed-off-by: mclarke <mclarke@spotify.com>

* more details to changeset

Signed-off-by: mclarke <mclarke@spotify.com>

.changeset/fresh-radios-compete.md

@@ -0,0 +1,14 @@
+---
+'@backstage/plugin-kubernetes': minor
+'@backstage/plugin-kubernetes-backend': minor
+'@backstage/plugin-kubernetes-common': minor
+---
+
+Add pod metrics lookup and display in pod table.
+
+## Backwards incompatible changes
+
+If your Kubernetes distribution does not have the [metrics server](https://github.com/kubernetes-sigs/metrics-server) installed,
+you will need to set the `skipMetricsLookup` config flag to `false`.
+
+See the [configuration docs](https://backstage.io/docs/features/kubernetes/configuration) for more details.