Windows net9.0 CI retries after test session timeout and exceeds PR runtime

[Widthdom]

Summary

The Build and Test workflow can spend more than 50 minutes in build (windows-latest, net9.0) when the first dotnet test run hits the repository TestSessionTimeout.

Observed

• The initial Windows/net9.0 run aborts at TestSessionTimeout=1800000 with Failed: 0.
• The workflow treats the non-zero exit as possible flakiness and starts a second full-suite retry.
• The retry causes the job to continue well past the useful diagnostic point.

Expected

The workflow should avoid retrying deterministic test-session timeouts, and the Windows/net9.0 lane should have a CI shape that can complete or fail with useful diagnostics within the intended job budget.

[Widthdom]

このCI修正は PR #3354 で対応中です。