e2e: use Ginkgo context

All code must use the context from Ginkgo when doing API calls or polling for a
change, otherwise the code would not return immediately when the test gets
aborted.

test/e2e/framework/metrics/api_server_metrics.go

@@ -43,8 +43,8 @@ func parseAPIServerMetrics(data string) (APIServerMetrics, error) {
 	return result, nil
 }
 
-func (g *Grabber) getMetricsFromAPIServer() (string, error) {
-	rawOutput, err := g.client.CoreV1().RESTClient().Get().RequestURI("/metrics").Do(context.TODO()).Raw()
+func (g *Grabber) getMetricsFromAPIServer(ctx context.Context) (string, error) {
+	rawOutput, err := g.client.CoreV1().RESTClient().Get().RequestURI("/metrics").Do(ctx).Raw()
 	if err != nil {
 		return "", err
 	}