Fix merging bug where downstream items somtimes got ignored if they appear after an upstream-only item. Also, reduce the severity of the validation error if a tech-domain is not recognised on a non-Foundation package.

component       dev_build_e32tools_uidcrc

source          /src/tools/build/e32tools/uidcrc
binary          /src/tools/build/e32tools/uidcrc/group all