docs: Add troubleshooting section for Spack

[stephenswat]

As @Cas1997 discovered, the DD4hep executables need some additional setup when using a Spack install. This commit adds documentation to the Spack page on how to do this, and on how to debug related issues.

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[paulgessinger]

Actually, our CMake will produce a this_acts_withdeps.sh file in the build directory, that also calls this script, but also G4, and sets up ODD. So maybe we should recommend that instead of the dd4hep script directly?