Improve the build plan selection error messages
Improve the build plan selection error messages

Provides more informative but concise error messages during stack init
build plan selection process.

phadej/stack,MichielDerhaeg/stack,phadej/stack,juhp/stack,luigy/stack,mrkkrp/stack,anton-dessiatov/stack,luigy/stack,sjakobi/stack,deech/stack,narrative/stack,martin-kolinek/stack,deech/stack,anton-dessiatov/stack,Blaisorblade/stack,juhp/stack,achernyak/stack,Heather/stack,AndreasPK/stack,sjakobi/stack,Heather/stack,AndreasPK/stack,achernyak/stack,mrkkrp/stack,Fuuzetsu/stack,martin-kolinek/stack,narrative/stack,MichielDerhaeg/stack,Blaisorblade/stack,harendra-kumar/stack,Fuuzetsu/stack,harendra-kumar/stack,AndrewRademacher/stack,AndrewRademacher/stack