Dev/riknoll/different toolbox fix #10587
Merged
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fixes microsoft/pxt-microbit#6201
fixes microsoft/pxt-microbit#6206
this pr reverts #10566 and fixes the same bug in a different, equally hacky way that should be less error prone. now we skip the variable deleting logic by tricking blockly's
Block.getVarModels()function which is used when blockly tries to gather all the usages of a particular variable in the workspace.this makes it so that the variable field returns a fake variable id when in the flyout, which should be safe to do AFAIK since our flyouts never get serialized and none of the variable fields can be interacted with.