Support outcome filtering option in test results

[Vinayak (vinayakmsft)]

Summary
Returns useful fields from test results, including testCaseTitle, errorMessage, stackTrace.
Adds optional outcomes parameter for server-side filtering (e.g. ["Failed", "Aborted"])
Why switch from getTestResultDetailsForBuild to getTestRuns + getTestResults
The previous API (getTestResultDetailsForBuild) returns lightweight result entries even with shouldIncludeResults=true — they contain only id, outcome, durationInMs, and testCaseReferenceId, but not testCaseTitle, errorMessage, or stackTrace. Its $filter parameter supports OData-style outcome filtering, but the results lack the detail fields that make them actionable.

getTestResults (per run) returns full TestCaseResult objects with all fields populated, and natively supports an outcomes parameter for server-side filtering. This avoids fetching all results when only failed test cases are needed.

GitHub issue number 887 and 985

Before the changes

After the changes - focused only on the failed test by using the filter logic

✅ PR Checklist

• I have read the contribution guidelines
• I have read the code of conduct guidelines
• Title of the pull request is clear and informative.
• 👌 Code hygiene
• 🔭 Telemetry added, updated, or N/A
• 📄 Documentation added, updated, or N/A
• 🛡️ Automated tests added, or N/A

🧪 How did you test it?

Local mcp testing

Replace with use cases tested and models used

[Codecov Comments Bot (codecov-commenter)]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@1d5f0eb). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/tools/test-plans.ts	77.77%	0 Missing and 2 partials ⚠️

Additional details and impacted files

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  Misses          ?       23           
  Partials        ?       78           

Flag	Coverage Δ
unittests	93.78% <77.77%> (?)

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[Zhaoyang Li (lizy14)]

nit: update PR title to better reflect the scope of changes. It's not just support output filtering; it also added test case name, error message, stack trace etc. in response