Resync from mainline.

[MattB-msft]

This pull request includes several updates to the DataverseClient project, focusing on upgrading target frameworks, improving logging, and enhancing error handling. Below is a summary of the most significant changes:

Framework Upgrades:

• Updated target frameworks from net6.0 to net8.0 in multiple project files, including Build.Common.StandardAndLegacy.props, Build.Common.core.props, and various test and PowerShell project files. [1] [2] [3] [4] [5] [6] [7] [8]

Logging Improvements:

• Modified constructors in AzAuth and AzPipelineFederatedIdentityAuth to use NullLogger.Instance when a logger is not provided, ensuring that logging is always initialized. [1] [2]

Error Handling Enhancements:

• Added an ErrorMessage property to the AuthenticationDetails class and updated the ProbeForExpectedAuthentication method to set detailed error messages when probing fails. [1] [2] [3] [4] [5]

Dependency Updates:

• Updated System.ServiceModel package version for post-net6.0 from 6.2.0 to 8.1.2 in Packages.props.

Minor Fixes:

• Corrected a typo in a method comment in AuthorityResolver.cs and added a missing parameter in AuthProcessor.cs. [1] [2]

These changes collectively improve the robustness, maintainability, and compatibility of the DataverseClient project.

[MattB-msft]

Fix for #481
Fix for #463