Various improvements

[AntonC9018]

• Make a few helper classes public
• Fix some formatting
• Use utf8 literals

[github-actions]

Qodana for .NET

3 new problems were found

Inspection name	Severity	Problems
Use preferred style for trailing comma before new line in multiline lists	🔴 Failure	1
Use preferred braces style (enforce braces in 'for' statement)	🔴 Failure	1
Type member is never used (private accessibility)	🔶 Warning	1

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (584b932) 70.89% compared to head (8ad1825) 70.88%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
...tCore/Extensions/EndpointRouteBuilderExtensions.cs	88.88%	2 Missing ⚠️
...e/Client/src/Core/Serialization/Iso8601Duration.cs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6818      +/-   ##
==========================================
- Coverage   70.89%   70.88%   -0.01%     
==========================================
  Files        2520     2520              
  Lines      126678   126686       +8     
==========================================
- Hits        89805    89799       -6     
- Misses      36873    36887      +14     

Flag	Coverage Δ
unittests	70.88% <92.85%> (-0.01%)	⬇️

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