fix(drag-drop): unable to move item into connected container by passing through another container #14651
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Fixes not being able to move an item from one container into another by passing it through an intermediate container that isn't connected to the final one. The issue comes from the fact that the way things are set up at the moment, the container from which the item started the sequence knows which containers it can go into, however all that knowledge is reset once the item enters into a different container. These changes rework the logic to have the individual containers know whether the item can enter into them and have the source container "ask" each of its siblings whether the item can enter.
Fixes #14645.