[rdct-tests]: rename shutdown -> closeProjectAndExitApp && shutdown -> exitApp

- comment about the fact it also closes the project

GitOrigin-RevId: c6cd02e81403feef3d9422fca27d3bf283ed288c

platform/remoteDev-util/src/com/intellij/remoteDev/tests/impl/DistributedTestHost.kt

@@ -211,10 +211,12 @@ open class DistributedTestHost(coroutineScope: CoroutineScope) {
             true
           }
         }
-
-        session.shutdown.adviseOn(lifetime, Dispatchers.Default.asRdScheduler) {
+        /**
+         * Includes closing the project
+         */
+        session.exitApp.adviseOn(lifetime, Dispatchers.Default.asRdScheduler) {
           lifetime.launch(Dispatchers.EDT + ModalityState.any().asContextElement() + NonCancellable) {
-            LOG.info("Shutting down the application...")
+            LOG.info("Exiting the application...")
             app.exit(true, true, false)
           }
         }

platform/remoteDev-util/src/com/intellij/remoteDev/tests/modelSources/DistributedTestModel.kt

@@ -58,7 +58,7 @@ object DistributedTestModel : Ext(TestRoot) {
     field("debugCategories", immutableList(string))
     property("ready", bool.nullable)
     signal("sendException", RdTestSessionException).async
-    signal("shutdown", void).async
+    signal("exitApp", void).async
     signal("showNotification", string)
     call("closeProject", void, bool).async
     call("closeProjectIfOpened", void, bool).async