Fix PowerShell exception handling and improve test isolation for Linux workflow compatibility#1

Fabio3rs merged 2 commits intomainFabio3rs/llvmup:mainfrom

copilot/fix-6243a012-b8ee-4029-a94e-9a76096b1604Fabio3rs/llvmup:copilot/fix-6243a012-b8ee-4029-a94e-9a76096b1604Copy head branch name to clipboard