fix: 13738 fix dotnet build warnings

[standeren]

Description

• Add some explicit package imports from transitive dependencies that were colliding with some of our packages.
• Add some explicit package imports from transitive dependencies that needed upgrading due to security vulnerabilities.
• Add #nullable enable in the classes that had nullable fields.
• Add required keyword in class fields that was not nullable but in a file that had #nullable enable.
• Add XML docs for arguments that did not have it.
• Replaced ISystemClock with TimeProvider in options for authentication helper due to obsolete warning.

Terminal when running dotnet build

Related Issue(s)

• #{issue number}

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.56%. Comparing base (cc8754c) to head (e644513).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14321   +/-   ##
=======================================
  Coverage   95.56%   95.56%           
=======================================
  Files        1843     1843           
  Lines       23886    23886           
  Branches     2752     2752           
=======================================
  Hits        22827    22827           
  Misses        802      802           
  Partials      257      257           

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