Fix build errors from obsolete MTP API usage

[Copilot]

• Replace deprecated AddTestSessionLifetimeHandle with AddTestSessionLifetimeHandler in MtpIntegration.cs
• Add #pragma warning disable CS0618 around CancelledTestNodeStateProperty usage in MtpLogger.cs
• Add explanatory comment for the CS0618 suppression
• Fix indentation of comment to match surrounding switch arms
• Build succeeds with 0 errors/warnings

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.62%. Comparing base (52858f4) to head (1cde2da).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   84.42%   84.62%   +0.20%     
==========================================
  Files          23       23              
  Lines         719      722       +3     
  Branches       85       85              
==========================================
+ Hits          607      611       +4     
  Misses         58       58              
+ Partials       54       53       -1     

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[Copilot]

Pull request overview

Updates the GitHub Actions Test Logger’s Microsoft.Testing.Platform (MTP) integration to compile cleanly against MTP 2.1.0 with TreatWarningsAsErrors=true, addressing newly-obsoleted APIs.

Changes:

• Replaced obsolete AddTestSessionLifetimeHandle with AddTestSessionLifetimeHandler for MTP 2.1.0 compatibility.
• Scoped suppression of CS0618 around CancelledTestNodeStateProperty handling to preserve backward compatibility without failing the build.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
GitHubActionsTestLogger/MtpIntegration.cs	Updates MTP test host registration to use the non-obsolete lifetime handler API.
GitHubActionsTestLogger/MtpLogger.cs	Adds a narrowly-scoped pragma to suppress obsolete warning for cancelled test node state mapping.

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[Tyrrrz]

@copilot please fix formatting errors

[Copilot]

@copilot please fix formatting errors

Fixed in 1cde2da — the comment was at column 0 instead of being indented to match the surrounding switch arms.