Added post limit warning (#26793)

* Renamed user limit API to app limit API

* Added post warning limit

* Added tests

* Fixed types

* Renamed AppLimits to ServerLimits

* Fixed tests and review fixes

* Updated generated code

* Updated server i18n

* Fixed TestCreateUserOrGuest test

* Exclude deleted posts from post count for liims

* Reduced limits for ease of testing

* Restored original limts

server/channels/app/user_test.go

@@ -2033,8 +2033,12 @@ func TestCreateUserOrGuest(t *testing.T) {
 		mockUserStore := storemocks.UserStore{}
 		mockUserStore.On("Count", mock.Anything).Return(int64(12000), nil)
 
+		mockPostStore := storemocks.PostStore{}
+		mockPostStore.On("AnalyticsPostCount", mock.Anything).Return(int64(1000), nil)
+
 		mockStore := th.App.Srv().Store().(*storemocks.Store)
 		mockStore.On("User").Return(&mockUserStore)
+		mockStore.On("Post").Return(&mockPostStore)
 
 		user := &model.User{
 			Email:         "TestCreateUserOrGuest@example.com",
@@ -2147,8 +2151,12 @@ func userCreationMocks(t *testing.T, th *TestHelper, userID string, activeUserCo
 	mockProductNoticeStore := storemocks.ProductNoticesStore{}
 	mockProductNoticeStore.On("View", userID, mock.Anything).Return(nil)
 
+	mockPostStore := storemocks.PostStore{}
+	mockPostStore.On("AnalyticsPostCount", mock.Anything).Return(int64(1000), nil)
+
 	mockStore := th.App.Srv().Store().(*storemocks.Store)
 	mockStore.On("User").Return(&mockUserStore)
+	mockStore.On("Post").Return(&mockPostStore)
 	mockStore.On("Group").Return(&mockGroupStore)
 	mockStore.On("Channel").Return(&mockChannelStore)
 	mockStore.On("Preference").Return(&mockPreferencesStore)