Update Microsoft.Internal.TestPlatform.Extensions to 18.3.11611.365

[nohwnd]

Fixes symbol resolution issues.

\
18.0.0-preview-1-10911-061 → 18.3.11611.365
\\

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

[Copilot]

Pull request overview

Updates the Microsoft.Internal.TestPlatform.Extensions dependency to a newer build to address symbol resolution issues, and adds regression tests / test assets to guard several previously fixed bugs across vstest, loggers, testhost hosting, and communication utilities.

Changes:

• Bumped Microsoft.Internal.TestPlatform.Extensions from 18.0.0-preview-1-10911-061 to 18.3.11611.365.
• Added multiple RegressionBugFixTests unit/integration test suites covering specific GH issues.
• Added new test assets projects for stderr output and special-character output scenarios.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
test/vstest.console.UnitTests/Processors/RegressionBugFixTests.cs	Adds regression coverage for code coverage runsettings template exclusions.
test/TestAssets/TestAssets.slnx	Registers new test asset projects in the test assets solution.
test/TestAssets/StderrOutputProject/UnitTest1.cs	Adds a test asset that writes to stderr while still passing.
test/TestAssets/StderrOutputProject/StderrOutputProject.csproj	Adds test asset project definition for stderr-output scenario.
test/TestAssets/SpecialCharOutputProject/UnitTest1.cs	Adds a test asset that emits invalid-XML Unicode characters to stdout.
test/TestAssets/SpecialCharOutputProject/SpecialCharOutputProject.csproj	Adds test asset project definition for special-char output scenario.
test/Microsoft.TestPlatform.TestHostProvider.UnitTests/Hosting/RegressionBugFixTests.cs	Adds regression tests for stderr forwarding level and ARM64 hosting behavior.
test/Microsoft.TestPlatform.ObjectModel.UnitTests/RegressionBugFixTests.cs	Adds regression test for null argument validation in PortablePdbReader.
test/Microsoft.TestPlatform.Extensions.TrxLogger.UnitTests/RegressionBugFixTests.cs	Adds regression tests for TRX logger error info init, overwrite warning, and enum serialization.
test/Microsoft.TestPlatform.Extensions.HtmlLogger.UnitTests/RegressionBugFixTests.cs	Adds regression tests for directory creation and invalid XML character handling.
test/Microsoft.TestPlatform.CommunicationUtilities.UnitTests/RegressionBugFixTests.cs	Adds regression tests for suppressing socket-related IOExceptions in error propagation.
test/Microsoft.TestPlatform.AdapterUtilities.UnitTests/RegressionBugFixTests.cs	Adds regression tests ensuring NET8+ serialization ctor is [Obsolete] while primary ctor isn’t.
test/Microsoft.TestPlatform.Acceptance.IntegrationTests/RegressionBugFixTests.cs	Adds end-to-end acceptance regression tests for socket stderr noise, stderr forwarding, and HTML logger output.
eng/Versions.props	Updates the MicrosoftInternalTestPlatformExtensions version property.