Unskip dump tests on macOS

[Copilot]

Enables dump tests on macOS that were previously skipped due to createdump not working correctly on the apphost.

Fixes #4800

Applied the same workaround pattern used in HangDumpProcessTreeTests via DumpWorkaround.GetGlobalPropertiesWorkaround():

• HangDumpOutputTests.cs: Removed OSCondition, added UseAppHost conditional
• HangDumpTests.cs: Removed OSCondition from 5 test methods, added UseAppHost conditional
• RetryFailedTestsTests.cs: Removed OSCondition from RetryFailedTests_MoveFiles_Succeeds, added UseAppHost conditional
• TrxTests.cs: Removed OSCondition from Trx_WhenTestHostCrash_ErrorIsDisplayedInsideTheTrx, added UseAppHost conditional

The fix conditionally disables apphost on macOS in test asset project files:

<!-- Before -->
<UseAppHost>true</UseAppHost>

<!-- After -->
<UseAppHost Condition="!$([MSBuild]::IsOSPlatform('OSX'))">true</UseAppHost>

Related: dotnet/runtime#119945

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 8xbvsblobprodcus382.vsblob.vsassets.io
  • Triggering command: /home/REDACTED/work/testfx/testfx/.dotnet/dotnet /home/REDACTED/work/testfx/testfx/.dotnet/dotnet msbuild /m /nologo /clp:Summary /v:minimal /nr:true /warnaserror /p:TreatWarningsAsErrors=true /p:ContinuousIntegrationBuild=false /home/REDACTED/work/testfx/testfx/artifacts/toolset/restore.proj /t:__WriteToolsetLocation /clp:ErrorsOnly;NoSummary /p:__ToolsetLocationOutputFile=/home/REDACTED/work/testfx/testfx/artifacts/toolset/11.0.0-beta.25575.1.txt (dns block)
  • Triggering command: ./.dotnet/dotnet ./.dotnet/dotnet build test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests.csproj --verbosity quiet (dns block)
• rcxvsblobprodcus328.vsblob.vsassets.io
  • Triggering command: ./.dotnet/dotnet ./.dotnet/dotnet build test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests.csproj --verbosity quiet (dns block)

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Unskip dump tests on macOS</issue_title>
<issue_description>Some tests under test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests, specifically in the following files:

• HangDumpOutputTests.cs
• HangDumpTests.cs
• RetryFailedTestsTests.cs
• TrxTests.cs

are skipped on macOS. We should unskip these tests and update them similar to HangDump_DumpAllChildProcesses_CreateDump in HangDumpProcessTreeTests using DumpWorkaround.GetGlobalPropertiesWorkaround</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Unskip dump tests on macOS #6911

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