[DEP] Remove deprecated WeightedEnsemble

[TonyBagnall]

Reference Issues/PRs

Part of #1518

scheduled removal of WeightedEnsemble

I have just removed the reference results as I assume they are not applicable to the the ClassifierEnsemble. Can put them back if they are actually still correct.

What does this implement/fix? Explain your changes.

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I would have added the following labels to this PR based on the changes made: [ $\color{#BCAE15}{\textsf{classification}}$, $\color{#45FD64}{\textsf{examples}}$, $\color{#2C2F20}{\textsf{testing}}$ ], however some package labels are already present.

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