[Armbian build PR] - pipeline: add userspace inventory capabilities

pipeline: add userspace inventory capabilities

• config_post_main: sanity checks for RELEASE (vs ARCH) and RELEASE+DESKTOP_ENVIRONMENT (vs ARCH)
  • the interactive menus didn't allow interactive users to select invalid combinations...
  • ... but if specified directly on cmdline, no checks were done at all.
  • introduce exit_with_target_not_supported_error(), which is just exit_with_error (code 43) but with code 44
    • this way the targets pipeline can just warn instead of break;
    • sometimes it's easier multiplying matrixes and skipping the few that can't be built
• rpi4b: use exit_with_target_not_supported_error() instead of exit_with_error() if RELEASE is not supported
• pipeline: add userspace inventory capabilities
  • digs into config/distributions and config/desktops for info
  • this produces output/info/all_userspace_inventory.json
    • this is now passed down to the targets-compositor in cli-jsoninfo
  • targets-compositor now accepts userspace: as items-from-inventory
  • extra: add targets-composed CLI command, to stop after targets-compositor
• pipeline: handle exit_with_target_not_supported_error() (retcode 44) as warning and not error
  • split errors and warnings into multiple lines, so a bit easier to see in the logs what the real error was
  • also turn down a few spurious warnings to debugs
• pipeline: use ncores * 4 for info gathering

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