[perf_tests]Cancel serverJob after each test, not only after all tests

GitOrigin-RevId: bddc72f5d6c48cde20d8c59a6542fb0f37a3323e

plugins/performanceTesting/event-bus/src/com/intellij/tools/ide/starter/bus/shared/SharedEventsFlow.kt

@@ -24,8 +24,6 @@ class SharedEventsFlow(
   private var serverJob: Job? = null
 
   fun endServerProcess() {
-    runBlocking { serverJob?.cancelAndJoin() }
-    serverJob = null
     client.endServerProcess()
   }
 
@@ -84,6 +82,8 @@ class SharedEventsFlow(
   }
 
   override fun unsubscribeAll() {
+    runBlocking { serverJob?.cancelAndJoin() }
+    serverJob = null
     processedEvents.clear()
     client.clear()
   }