Stage 3: Forward BuildProjectFile* callbacks from OOP TaskHost to worker node#13350

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JanProvaznik wants to merge 13 commits intodotnet:mainfrom

JanProvaznik:ibuildengine-callbacks-stage3

Commits on Mar 9, 2026

Add TaskHostBuildRequest/Response packet pair for BuildProjectFile callbacks

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Implement BuildProjectFile* callbacks in OutOfProcTaskHostNode

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Handle BuildProjectFile requests in TaskHostTask (worker node side)

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Add BuildProjectFileTask test task and E2E test assets

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Add comprehensive tests for BuildProjectFile* callback forwarding

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Add defensive null check for TargetOutputsPerProject in 7-param overload

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Commits on Mar 10, 2026