Add copy button in headings

**Description**
Add the copy button in headings when the mouse is over the heading.

**Affected doc version/s**
Since 7.0

**(Optional) Additional details**

- Icon: Copy
- Light color: #B2B9BE
- Dark color: #B2B9BE

Figma design -> 

<img width="879" height="302" alt="Image" src="https://github.com/user-attachments/assets/6acdb9e0-975c-417e-b8b3-611053d50a15" />