Handle nested and aliased fields correctly when copying mapping. #50918
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Currently, the mapping of a dependent variable which is either nested (
outer.inner) or an alias is handled incorrectly.This PR fixes it as it always fetches the mapping of a concrete field (i.e. the field that alias is pointing to).
Also it allows nested dependent variables as it traverses the path using
extractValuemethod rather than simpleget.Relates #50787