Fix kubeconfig-sync issues (#2692)

- Removed `getFreePort` as its use is always a race condition. Change
  all uses of it to retrive the port after listening

- Added `getPortFrom` as a helper function to read a port from a stream

- Remove `Cluster.ownerRef` as it is outdated and no longer needed for 5.0

- Remove `Cluster.enabled`, no longer needed because of above

- Removed `Cluster.init`, moved its contents into `Cluster.constructor`
  as nothing in that function is asyncronous. Currently only being run
  on `main` as a stop gap until `renderer` gets its own version of
  `Cluster`

- Refactored `LensProxy` so as to prevent `pty.node` (a NodeJS
  extension) being included in `webpack.extension.ts`'s run

- Removed the passing around of the proxy port as that can now be
  accessed from an instance of `LensProxy`

- purge ContextHandler's cache on disconnect

Co-authored-by: Sebastian Malton <sebastian@malton.name>

src/renderer/components/cluster-settings/cluster-settings.tsx

@@ -13,13 +13,7 @@ import { CatalogEntity } from "../../api/catalog-entity";
 
 
 function getClusterForEntity(entity: CatalogEntity) {
-  const cluster = ClusterStore.getInstance().getById(entity.metadata.uid);
-
-  if (!cluster?.enabled) {
-    return null;
-  }
-
-  return cluster;
+  return ClusterStore.getInstance().getById(entity.metadata.uid);
 }
 
 entitySettingRegistry.add([

src/renderer/components/cluster-settings/components/remove-cluster-button.tsx

@@ -27,10 +27,8 @@ export class RemoveClusterButton extends React.Component<Props> {
   }
 
   render() {
-    const { cluster } = this.props;
-
     return (
-      <Button accent onClick={this.confirmRemoveCluster} className="button-area" disabled={cluster.isManaged}>
+      <Button accent onClick={this.confirmRemoveCluster} className="button-area">
         Remove Cluster
       </Button>
     );