Normalize distinguished name field abbreviations for platform compatibility of attribute State/ProvinceName

[mrsuciu]

Proposed changes

The reference value for the stateOrProvinceName attribute of a Distinguished Name is "ST".
It appears that Microsoft is using a nonstandard abbreviation for the stateOrProvinceName attribute as being "S".
This PR normalizes them so that the X509Utils.CompareDistinguishedNameFields would match two identifiers of values "S" and "ST".

Related Issues

• Fixes X509Utils.CompareDistinguishedNameFields Failing a Valid SubjectName Comparison #3318

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• Enhancement (non-breaking change which adds functionality)
• Test enhancement (non-breaking change to increase test coverage)
• Breaking change (fix or feature that would cause existing functionality to not work as expected, requires version increase of Nuget packages)
• Documentation Update (if none of the other choices apply)

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.00%. Comparing base (d25caff) to head (ab64229).
⚠️ Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
...ack/Opc.Ua.Core/Security/Certificates/X509Utils.cs	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3358      +/-   ##
==========================================
+ Coverage   51.86%   60.00%   +8.13%     
==========================================
  Files         370      371       +1     
  Lines       78618    78225     -393     
  Branches    13650    13602      -48     
==========================================
+ Hits        40779    46940    +6161     
+ Misses      33705    26977    -6728     
- Partials     4134     4308     +174     

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