[perf_tests]AT-840/AT-839. Added yield into ChooseCompletionCommand

GitOrigin-RevId: bd975efcef60ac399757ac3f7eb7c02e506c423e

plugins/performanceTesting/core/src/com/jetbrains/performancePlugin/commands/ChooseCompletionCommand.kt

@@ -37,6 +37,7 @@ class ChooseCompletionCommand(text: String, line: Int) : PlaybackCommandCoroutin
               }
             }
           }
+          yield()
         }
       }
     }