Add performance deltas between app deployments on Merge Request widget

What does this MR do?

Add performance delta via memory usage before and after deployment on MR widget.

Screenshots

Increased - When Memory From is less than Memory To

Decreased - When Memory From is more than Memory To

Unchanged - When Memory From is same as Memory To

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #27439 (closed)