Add some basic unit tests for the following files: (#1050)

* Add some basic unit tests for cluster, kube-auth-proxy, and kubeconfig-manager

- src/main/cluster.ts
- src/main/kube-auth-proxy.ts
- src/main/kubeconfig-manager.ts

Signed-off-by: Sebastian Malton <sebastian@malton.name>

integration/helpers/utils.ts

@@ -12,7 +12,7 @@ export function setup(): Application {
     args: [],
     path: AppPaths[process.platform],
     startTimeout: 30000,
-    waitTimeout: 30000,
+    waitTimeout: 60000,
     chromeDriverArgs: ['remote-debugging-port=9222'],
     env: {
       CICD: "true"