[Testing] Surface testing failures better so we can differentiate between tests and infrastructure.

[PureWeen]

Description

• When something inside the cake script fails it just gets reported out as a general exit code "Bash exited with code '1'.". Ideally we can surface the actual exception which will let us better organize around what is failing
• Surface appium failures better. Currently if the appium driver fails it just goes through an entire test run and reports "UIAUTOMATER" failed. Tis causes all those tests to get incremented as "problematic" but the tests themselves didn't fail https://github.com/dotnet/maui/issues/20452 . Ideally these types of failures wouldn't upload the testing files and the error would just get reported out as failed infrastructure.

[ghost]

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