CTest follow-up: debug PICMI restart tests

[EZoni]

Debug the following restart test:

• https://github.com/ECP-WarpX/WarpX/blob/e4cd1aa8c9314995afe04c4a1aa6e937088a1b74/Examples/Tests/restart_eb/CMakeLists.txt#L19-L28
• https://github.com/ECP-WarpX/WarpX/blob/ab91803ad00ee3962daabb9322ab0406e8e01cdc/Examples/Tests/restart/CMakeLists.txt#L30-L38