[release/13.2][CI] Unified test splitting infrastructure for CI parallelization#14858

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radical merged 15 commits intodotnet:release/13.2from

radical:add-test-splitting-infrastructure

Mar 3, 2026

Commits on Mar 2, 2026

Add ExtractTestPartitions tool and CI test matrix scripts

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Replace TestRunsheetBuilder with TestEnumerationRunsheetBuilder

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Configure test projects for unified CI splitting infrastructure

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Simplify CI workflows to use unified test matrix

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Update Helix targets to consume new partitions JSON format

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Add Infrastructure.Tests for CI tooling validation

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Add CI testing documentation and rebalance-tests skill

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Add partition traits to Aspire.Hosting.Tests for CI parallelization

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Remove rebalance-tests skill

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Fix ExtractTestPartitions race condition and remove silent fallback

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Fix CLI E2E tests: add missing PR env vars to nuget-dependent test steps

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Fix GenerateTestPartitionsForCI running during GitHub Actions test execution

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Fix RepoRoot path quoting for Windows in GenerateTestPartitionsForCI

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Commits on Mar 3, 2026