Fix caching of task ext properties with the strict parser #6696
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Close #6695
This PR updates the strict parser to collect references to
task.ext.*so that they are added to the task hash (docs).I originally thought to move the
VariableVisitorintonf-langso that it is re-used by both, but I think this visitor does a lot of unnecessary work, and I didn't want to alter the old parser too much, so I just created a separate implementation for the strict parser that is much simpler. It only collects references totask.ext.*instead of all variable references.Note to self: once we make the strict parser the default (#6643), we should revisit the runtime layer and how it handles these variable references. I think it could be simplified quite a bit.