[CI Postmortem] Linker test build failures (trimmode copy, link all) across PRs

[rolfbjarne]

Summary

Linker-related test configurations are failing to build across 4 different PRs (9 builds): trimmode copy/tvOS, link all/tvOS.

Classification

• Category: Build Failure
• Impact: 4 PRs, 9 builds
• Period: Last 7 days

Affected PRs

#25077, #25180, #25183, #25195

Failing configurations

• trimmode copy/tvOS - simulator/Debug: BuildFailure (PRs [net11.0] Support multiple R2R images for ios/tvos apps #25077, [dotnet] Add test project templates for all Apple platforms #25195)
• link all/tvOS - simulator/Debug: BuildFailure (PRs [net11.0] Support multiple R2R images for ios/tvos apps #25077, [Foundation] Enable HTTP digest auth in NSUrlSessionHandler #25180)
• Linker job also fails without TestSummary in 9 builds

Pattern

The tvOS linker test configurations consistently fail to build, which is unlikely to be caused by unrelated PR changes.

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Filed automatically by CI postmortem analysis.

[rolfbjarne]

Closing: re-filing with deeper per-test analysis.