test(apps): add acceptance test for Cloud Controller API log emission

Cloud Controller emits lifecycle log messages (e.g. "Created app with guid ...")
via loggregator under the [API/*] source tag when processing an app push.

This test verifies those logs appear in the app's recent log stream, providing
an end-to-end check that the loggregator emitter in CCNG correctly forwards
messages through the loggregator v2 gRPC client introduced in
cloudfoundry/cloud_controller_ng#5043.

Author: serdarozerr

apps/running_log.go

@@ -60,4 +60,10 @@ var _ = AppsDescribe("app logs", func() {
 			return logs.Recent(appName).Wait().Out
 		}).Should(Say(fmt.Sprintf("\\[APP(.*)/0\\]\\s*ERR %s", message)))
 	})
+
+	It("captures [API/*] logs emitted by the Cloud Controller", func() {
+		Eventually(func() *Buffer {
+			return logs.Recent(appName).Wait().Out
+		}).Should(Say(`\[API/\d+\]\s*OUT Created app with guid `))
+	})
 })