Fix GITHUB_STEP_SUMMARY size limit exceeded with non-ASCII characters

[Copilot]

• Fix TruncateSummary in GitHubWorkflow.cs: truncate by UTF-8 byte count instead of char count
• Fix CreateSummaryAsync in GitHubWorkflow.cs: write truncated content to file
• Update PowerKit to 1.2.0 and use string.TruncateBytes(int byteCount, Encoding?) from PowerKit
• Remove custom StringExtensions.cs from Utils/Extensions/ (superseded by PowerKit)
• Add tests for non-ASCII truncation in MtpSummarySpecs and VsTestSummarySpecs
• Include newlines inside content before truncation so byte estimation is always accurate and the file never exceeds the limit
• Rename fullContent → actualContent in CreateSummaryAsync
• Rename truncated → truncatedContent in CreateSummaryAsync

[Tyrrrz]

@copilot update PowerKit to 1.2.0 and use its newly introduced string.TruncateBytes method.

[Copilot]

@copilot update PowerKit to 1.2.0 and use its newly introduced string.TruncateBytes method.

Done in fe46a5f. Updated PowerKit to 1.2.0 in Directory.Packages.props, removed the custom StringExtensions.cs, and updated GitHubWorkflow.cs to call content.TruncateBytes(availableSize, Encoding.UTF8) from PowerKit.

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.00%. Comparing base (a3b9120) to head (6aeba53).
⚠️ Report is 1 commits behind head on prime.

Files with missing lines	Patch %	Lines
GitHubActionsTestLogger/GitHub/GitHubWorkflow.cs	77.77%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #75      +/-   ##
==========================================
- Coverage   85.22%   85.00%   -0.22%     
==========================================
  Files          19       19              
  Lines         758      747      -11     
  Branches       85       85              
==========================================
- Hits          646      635      -11     
  Misses         59       59              
  Partials       53       53              

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[Copilot]

Pull request overview

This PR fixes GitHub Actions step summary truncation so the 1 MiB limit is respected when summaries contain multi-byte (non-ASCII) characters, and ensures the truncated output is what actually gets written.

Changes:

• Truncate summary content by UTF-8 byte budget (via PowerKit TruncateBytes) rather than by character index.
• Write the computed truncated summary to GITHUB_STEP_SUMMARY (instead of the original content).
• Add regression tests (VsTest + MTP) covering near-full summary files with CJK characters, and bump PowerKit to 1.2.0.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
GitHubActionsTestLogger/GitHub/GitHubWorkflow.cs	Fixes truncation to be UTF-8 byte-aware and ensures truncated content is written.
GitHubActionsTestLogger.Tests/VsTestSummarySpecs.cs	Adds a regression test for non-ASCII content near the summary size limit.
GitHubActionsTestLogger.Tests/MtpSummarySpecs.cs	Adds a corresponding regression test for the MTP path.
Directory.Packages.props	Updates PowerKit dependency to 1.2.0.

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