add test event trigger to the app layer

Author: mkardous-silabs

src/app/BUILD.gn

@@ -212,6 +212,7 @@ static_library("interaction-model") {
     ":constants",
     ":paths",
     ":subscription-info-provider",
+    ":test-event-trigger",
     "${chip_root}/src/app/MessageDef",
     "${chip_root}/src/app/icd/server:icd-server-config",
     "${chip_root}/src/app/icd/server:manager",