plugins/podman: Minor fixes

Merged Ondřej Míchal requested to merge HarryMichal/gnome-builder:podman-minor-fixes into master

I made some minor fixes to the code of plugins/podman. I mainly initially missed the debug macros (e.g., IDE_ENTRY,..). At some point, I was comparing how launcher is implemented and compared it to the way it is implemented in plugins/flatpak and adjusted it to reflect the implementation in plugins/flatpak.

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