feat: pass along write_artifacts to loaders
#779
Merged
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Taskgraph already passes this information along to transforms, and over in https://bugzilla.mozilla.org/show_bug.cgi?id=1989038 we have a use case to have loaders know about it too: we need to write out an artifact whose contents are only known after all tasks for a specific kind have been loaded and transformed.
(Technically we could avoid passing this along, but it would mean we have no reasonable way to switch off the writing of this artifact outside of decision tasks...)