Quarantine flaky test PublishCommandWithoutOutputPathUsesDefaultSubdirectory

[Copilot]

This PR quarantines the test PublishCommandWithoutOutputPathUsesDefaultSubdirectory in the Aspire.Cli.Tests.Commands.PublishCommandTests class by adding the [QuarantinedTest] attribute.

The test was identified as flaky and needed to be excluded from regular CI test runs to prevent false failures. The test has been quarantined with a placeholder issue URL and will now only run in the dedicated quarantine test workflow.

Changes Made

• Added [QuarantinedTest("https://github.com/dotnet/aspire/issues/9999")] attribute to the PublishCommandWithoutOutputPathUsesDefaultSubdirectory test method
• The test will now be excluded from regular test runs (when --filter-not-trait "quarantined=true" is used)
• The test can still be executed specifically in quarantine test workflows

Verification

• ✅ Project builds successfully with no compilation errors
• ✅ Regular test runs now exclude the quarantined test (test count reduced from 150 to 149 in the Commands namespace)
• ✅ Quarantined tests can still be run specifically when needed

This follows the established pattern for quarantining flaky tests in the Aspire repository and ensures CI stability while preserving the test for future debugging and fixes.

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[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 11398

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 11398"

[Copilot]

Pull Request Overview

This PR quarantines a flaky test to improve CI stability by adding the [QuarantinedTest] attribute to exclude it from regular test runs while preserving it for debugging purposes.

• Added [QuarantinedTest("https://github.com/dotnet/aspire/issues/9999")] attribute to the PublishCommandWithoutOutputPathUsesDefaultSubdirectory test method
• The test will be excluded from regular CI runs using the --filter-not-trait "quarantined=true" filter
• Test remains available for execution in dedicated quarantine workflows