Fix CI flakiness: MSB4216 task host failures, dotnet-watch hangs, NuGet errors#53424

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mmitche wants to merge 38 commits intomainfrom

fix/ci-flakiness/main

Commits on Mar 15, 2026

Fix CI flakiness: 5 root causes addressing 48% failure rate
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Commits on Mar 18, 2026

Trigger CI build #4 - streak: 3/25

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Trigger CI build #5 - streak reset (dotnet-watch flaky test)

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Trigger CI build #6 - streak: 1/25

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Trigger CI build #7 - streak: 2/25

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Fix flaky dotnet-watch ProjectUpdateInProcTests race condition

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ci: validation run 9

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ci: validation run 10

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Commits on Mar 19, 2026

ci: validation run 11

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ci: validation run 12

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ci: validation run 13

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Fix DefaultRequestDispatcherTest hang: use kernel waits instead of async

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Fix xUnit1031: use dedicated thread for timeout instead of Task.Wait

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Fix TemplateEngine snapshot flakiness and BrowserDiagnostics hang

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ci: validation run 15

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ci: validation run 16

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ci: validation run 17

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ci: validation run 18

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Commits on Mar 20, 2026

ci: validation run 19

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ci: trigger validation run 19

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ci: validation run 20

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ci: validation run 21

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Fix Aspire test hang: skip Console.ReadKey when stdin is redirected

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ci: trigger validation run 22

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Merge upstream/main and resolve PhysicalConsole.cs conflict

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ci: validation run 23

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ci: validation run 24

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ci: retrigger validation run 24

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ci: validation run 25

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ci: validation run 26

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Commits on Mar 21, 2026

ci: validation run 27

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ci: validation run 28

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ci: validation run 29

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