built-in rules: describe staging conflict in more detail

Mentioning in particular the involved artifacts as well as the direct
dependencies that brought them in. Here, we are in a simple situation
as all built-in rules that check conflicts only use artifacts and
runfiles of their dependencies, but not the provided data.

Also, the built-in rules that check staging conflicts do not do
configuration transitions, hence it is enough to show the target
name of the dependencies containing the artifact if for the built-in
target we show the configuration.

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