Change rounding on code coverage badge to be consistent with other displays

What does this MR do?

Changes coverage badges to use two fractional digits precision (actual value being rounded).

Are there points in the code the reviewer needs to double check?

None.

Why was this MR needed?

Make coverage badge consistent with other displays.

Screenshots (if relevant)

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?

#25327 (moved)