Resolve "Use long sha version in MR widget copy to clipboard button"

What does this MR do?

Uses long sha version of the merged commit in MR widget copy to clipboard button

Does this MR meet the acceptance criteria?

• Tests added updated for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a Frontend maintainer
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them

What are the relevant issue numbers?

Closes #48050 (closed)