Moving app from singular to being created for every request (#9889)

* Moving app from singular to being created for every request.

* Automatic refactor

* Adding license header

* Feedback fixes

migrations/migrationstestlib.go

@@ -21,6 +21,7 @@ import (
 
 type TestHelper struct {
 	App          *app.App
+	Server       *app.Server
 	BasicTeam    *model.Team
 	BasicUser    *model.User
 	BasicUser2   *model.User
@@ -85,13 +86,14 @@ func setupTestHelper(enterprise bool) *TestHelper {
 		options = append(options, app.StoreOverride(testStore))
 	}
 
-	a, err := app.New(options...)
+	s, err := app.NewServer(options...)
 	if err != nil {
 		panic(err)
 	}
 
 	th := &TestHelper{
-		App:            a,
+		App:            s.FakeApp(),
+		Server:         s,
 		tempConfigPath: tempConfig.Name(),
 	}
 
@@ -290,7 +292,7 @@ func (me *TestHelper) AddUserToChannel(user *model.User, channel *model.Channel)
 }
 
 func (me *TestHelper) TearDown() {
-	me.App.Shutdown()
+	me.Server.Shutdown()
 	os.Remove(me.tempConfigPath)
 	if err := recover(); err != nil {
 		StopTestStore()