test(e2e): fix test case for updating the collector configuration

This test broke in commit 6b4da30,
when the export in the monitoring resource for e2e test was changed from
an http exporter to a dash0 exporter.

test/e2e/dash0_monitoring_resource.go

@@ -92,7 +92,7 @@ func updateEndpointOfDash0MonitoringResource(
 ) {
 	updateDash0MonitoringResource(
 		namespace,
-		fmt.Sprintf("{\"spec\":{\"export\":{\"http\":{\"endpoint\":\"%s\"}}}}", newEndpoint),
+		fmt.Sprintf("{\"spec\":{\"export\":{\"dash0\":{\"endpoint\":\"%s\"}}}}", newEndpoint),
 	)
 }
 

test/e2e/e2e_test.go

@@ -747,9 +747,10 @@ var _ = Describe("Dash0 Kubernetes Operator", Ordered, func() {
 			By("updating the Dash0 monitoring resource endpoint setting")
 			newEndpoint := "ingress.us-east-2.aws.dash0-dev.com:4317"
 			updateEndpointOfDash0MonitoringResource(applicationUnderTestNamespace, newEndpoint)
-			// Note: updating the endpoint in this way will lead to telemetry from the applications under test no longer
-			// being sent to otlp-sink. This is not relevant for this test case, but might be an issue if we ever add
-			// more tests to this suite after this one.
+			defer func() {
+				// reset the endpoint to the default after this test
+				updateEndpointOfDash0MonitoringResource(applicationUnderTestNamespace, defaultEndpoint)
+			}()
 
 			By("waiting for self-monitoring metrics")
 			Eventually(func(g Gomega) {