Failed tests swallow exception message in `GivenThatIWantToInstallDotnetFromAScript.Dispose()`

[PhilippNaused]

Found a flaky test failure:

Failed Microsoft.DotNet.InstallationScript.Tests.GivenThatIWantToInstallDotnetFromAScript.WhenInstallingTheSdk(channel: "5.0", quality: null, versionRegex: "5\\.0\\..*") [22 s]
Error Message:
  System.Exception : Failed to remove C:\Users\cloudtest\AppData\Local\Temp\InstallScript-Tests\haa2c0db.rv2
Stack Trace:
  at Microsoft.DotNet.InstallationScript.Tests.GivenThatIWantToInstallDotnetFromAScript.Dispose() in D:\a\_work\1\s\tests\Install-Scripts.Test\GivenThatIWantToInstallDotnetFromAScript.cs:line 210

This is also where the warning tests\Install-Scripts.Test\GivenThatIWantToInstallDotnetFromAScript.cs(208,48): warning CS0168: The variable 'e' is declared but never used comes from.