show only relevant digits for build truncate info. Fixes #32011

What does this MR do?

show only relevant digits for build truncate info.

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

Why was this MR needed?

I was shown '499.96484375KiB  in bytes' which seems to mean
my traceback was truncated at 0.84375 in the midpoint of a
Byte, or 6.75 bits.

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?

#32011 (moved)