[release/7.0] Fix FormattingHelpers.CountDigits(UInt128) and add more tests for Int128/UInt128.ToString #74536
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Backport of #74501 to release/7.0
/cc @tannergooding
Customer Impact
Developers will not be able to successfully format certain Int128 or UInt128 strings
Testing
Additional tests were added covering the explicitly flagged scenarios as well as other boundary values to validate correct formatting.
Risk
Minimal, there are now tests explicitly covering each of the possible CountDigits code paths. This code path is only used by Int128/UInt128 which are new types in .NET 7