[Tests] Remove net 462 CI / Add TestContext Logging support for GDS Tests / Fix Tests for netstandard

[romanett]

Proposed changes

• Remove net 462 CI
• Add TestContext Logging support for GDS Tests
• Fix Tests for netstandard

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• 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)

Checklist

• I have read the CONTRIBUTING doc.
• I have signed the CLA.
• I ran tests locally with my changes, all passed.
• I fixed all failing tests in the CI pipelines.
• I fixed all introduced issues with CodeQL and LGTM.
• I have added tests that prove my fix is effective or that my feature works and increased code coverage.
• I have added necessary documentation (if appropriate).
• Any dependent changes have been merged and published in downstream modules.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.49%. Comparing base (a86077a) to head (1f7b1e7).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3170      +/-   ##
==========================================
- Coverage   57.92%   57.49%   -0.43%     
==========================================
  Files         351      353       +2     
  Lines       80471    80549      +78     
  Branches    14028    14037       +9     
==========================================
- Hits        46611    46312     -299     
- Misses      29561    29955     +394     
+ Partials     4299     4282      -17     

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[Copilot]

Pull Request Overview

This PR removes .NET Framework 4.6.2 CI pipeline support and enhances test infrastructure by adding TestContext logging support for GDS tests and fixing netstandard compatibility issues.

• Removes the .NET 4.6.2 CI stage from azure-pipelines.yml
• Adds TestContext logging integration to GDS test infrastructure
• Updates conditional compilation directives from NET7_0_OR_GREATER to NET8_0_OR_GREATER for netstandard compatibility

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
azure-pipelines.yml	Removes .NET 4.6.2 CI test stage
Tests/Opc.Ua.Server.Tests/ReferenceServerTest.cs	Disables sampling groups in reference node manager
Tests/Opc.Ua.Gds.Tests/PushTest.cs	Adds TestContext.Out logging support to GDS test setup
Tests/Opc.Ua.Gds.Tests/GlobalDiscoveryTestServer.cs	Implements TestContext logging infrastructure with configurable log levels
Tests/Opc.Ua.Gds.Tests/Common.cs	Updates conditional compilation and adds TestContext writer parameter
Tests/Opc.Ua.Gds.Tests/ClientTest.cs	Integrates TestContext logging in client tests
Tests/Opc.Ua.Core.Tests/Types/Encoders/XmlEncoderTests.cs	Updates conditional compilation directive
Tests/Opc.Ua.Core.Tests/Types/Encoders/EncoderSpanExtensions.cs	Adds new extension methods for netstandard compatibility
Tests/Opc.Ua.Core.Tests/Security/Certificates/ApplicationTestDataGenerator.cs	Updates conditional compilation directive

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[romanett]

Netstandard CI Run: https://opcfoundation.visualstudio.com/opcua-netstandard/_build/results?buildId=10870&view=results