Explicitly dispose summaryWriter before reading file in truncation tests

[Copilot]

In the "nearly full summary file" truncation tests, the summaryWriter (backed by a file stream opened for writing) was left open when File.ReadAllBytes was called. On Windows, opening a second handle for reading conflicts with the existing write handle, causing the test to fail.

The fix adds an explicit await summaryWriter.DisposeAsync() call immediately after FlushAsync() and before the file read in both affected tests:

• VsTestSummarySpecs.cs — I_can_try_to_use_the_logger_to_produce_a_summary_when_the_output_file_is_nearly_full_and_get_a_truncated_summary
• MtpSummarySpecs.cs — same test in the MTP variant

Closing the write handle first means File.ReadAllBytes can always open the file for reading without a sharing-mode conflict, on both Windows and Linux.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.22%. Comparing base (ccacd59) to head (6d846bc).
⚠️ Report is 1 commits behind head on prime.

Additional details and impacted files

@@           Coverage Diff           @@
##            prime      #76   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files          19       19           
  Lines         758      758           
  Branches       85       85           
=======================================
  Hits          646      646           
  Misses         59       59           
  Partials       53       53           

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[Copilot]

Pull request overview

Fixes Windows-only failures in the “nearly full summary file” truncation tests by ensuring the summary file’s write handle is closed before attempting to reopen the same file for reading.

Changes:

• Explicitly disposes the file-backed summaryWriter after FlushAsync() and before reading bytes from the summary file in the VsTest truncation test.
• Applies the same disposal fix to the MTP truncation test variant.

Reviewed changes

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

File	Description
GitHubActionsTestLogger.Tests/VsTestSummarySpecs.cs	Disposes the file-backed summary writer before reading the summary file to avoid sharing conflicts on Windows.
GitHubActionsTestLogger.Tests/MtpSummarySpecs.cs	Mirrors the same early-dispose behavior for the MTP variant of the truncation test.

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