chore(common): builder should make sure that dep builds are not later called as child builds and vice-versa

[mcdurdin]

Compare the later entries in both sections; they're nigh-identical.

First set of calls: as a child script, from the top-level build.sh.

Second set: as a dependency, from web/src/test/manual, which does not include web/src/tools as a viable child-project folder.

I reckon we should consider tweaking builder.inc.sh to handle the scenario of child vs dependency calls resulting in multiple calls.

Originally posted by @mcdurdin in #9743 (comment)