Add relationship between "template story" and "client instance story"

**Before we start...:**

- [x] I checked the documentation and didn't find this feature
- [x] I checked to make sure that this feature has not already been requested

**Branch/Commit:**

main branch

**Describe the feature:**

Please include a detailed description of the feature you are requesting and any detail on it’s expected behavior.

> **As a user**
> **I clone a template story**
> **And then I add it to my client project**
> **And I see a relationship between the template story and the client instance story**

**Problem:**

Please include a detailed description of the problem this feature would solve.

> **As an admin**
> **I want to be able to keep a relationship between a template story and a client instance story**
> **So that I can later get insights from past upgrade projects**

**Resources:**

Let's say that there is a story (https://points.ombulabs.com/projects/181/stories/3334) in a template for a version jump (4.2 to 5.0) and I go ahead and clone that story for a new client project.

Then I would expect to see a relationship in the database that connects the template story to the instance story.

In the future, one would get insights from other client projects.

A person who is working on estimate an instance of https://points.ombulabs.com/projects/181/stories/3334 could talk to client project Acme's team and ask them about their experience with it.

**I will abide by the [code of conduct](https://github.com/fastruby/points/blob/main/CODE_OF_CONDUCT.md)**

Bắt đầu bằng cách lần theo luồng nhân bản story và các model hoặc mối quan hệ trong cơ sở dữ liệu dành cho story template và story instance của client. Được xem là hoàn tất khi việc nhân bản lưu một liên kết có thể truy vấn giữa hai story, hỗ trợ các project insights trong tương lai được yêu cầu; issue không nêu file hoặc test nào.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.