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_node/image_credential_provider.go

@@ -63,6 +63,6 @@ var _ = SIGDescribe("ImageCredentialProvider [Feature:KubeletCredentialProviders
 		}
 
 		// CreateSync tests that the Pod is running and ready
-		podClient.CreateSync(pod)
+		podClient.CreateSync(ctx, pod)
 	})
 })