[release/7.0] Fix FormattingHelpers.CountDigits(UInt128) and add more tests for Int128/UInt128.ToString#74536

carlossanlop merged 1 commit intorelease/7.0dotnet/runtime:release/7.0from

backport/pr-74501-to-release/7.0dotnet/runtime:backport/pr-74501-to-release/7.0Copy head branch name to clipboard