feat: add CSE timing regression tests for all Linux VHDs (Ubuntu 22.04/24.04, Azure Linux V3)#8284

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djsly wants to merge 10 commits intomainfrom

fix/cse-apt-lock-contention-and-perf-tests

Commits on Apr 14, 2026

fix: use dpkg instead of apt for cached packages to eliminate CSE lock contention

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fix: address PR review comments for CSE timing tests

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feat: use t.Run() sub-tests for ADO pipeline tracking and tighten thresholds

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feat: set CSE thresholds from production telemetry (Ubuntu 22.04 p95/p99)

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feat: track all CSE tasks >1s with dynamic catch-all and expanded thresholds

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feat: add CSE perf tests for Ubuntu 24.04 and Azure Linux V3

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fix: address second round of review comments on CSE timing tests

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fix: unwrap testLogger to get *testing.T for sub-test support

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Commits on Apr 15, 2026