MM-26031: Migrate reaction store to plain errors (#14931)

* ReactionStore migration to return plain errors

* Fix translations

* FixImports

* Rollback fix imports

* Fix merge conflict

* add ent translation

Co-authored-by: Rodrigo Villablanca <villa061004@gmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/import_functions.go

@@ -953,8 +953,14 @@ func (a *App) importReaction(data *ReactionImportData, post *model.Post, dryRun
 		EmojiName: *data.EmojiName,
 		CreateAt:  *data.CreateAt,
 	}
-	if _, err = a.Srv().Store.Reaction().Save(reaction); err != nil {
-		return err
+	if _, nErr := a.Srv().Store.Reaction().Save(reaction); nErr != nil {
+		var appErr *model.AppError
+		switch {
+		case errors.As(nErr, &appErr):
+			return appErr
+		default:
+			return model.NewAppError("importReaction", "app.reaction.save.save.app_error", nil, nErr.Error(), http.StatusInternalServerError)
+		}
 	}
 
 	return nil