Bug: Investigate potential memory issue with Legend Query and Legend Taxonomy

[akphi]

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Legend Query, Legend Taxonomy

Current and expected behavior

Legend Query and Legend Taxonomy there is a memory leak when rebuilding a new graph as we don't clear the old graph. Example a big dataspace, taking about ~450MB of memory. When this dataspace is picked memory went up to 450MB, when a new dataspace (smaller) was picked, the memory increased to around 650MB. The memory should decrease as we don't need the old graph as well. When the big dataspace is changed the memory size went above 1000 MB and caused a crash on chrome.

Another thing to check is when we switch between graphs in legend query, how do we make sure to completely reset the graph?

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This is part of the effort outlined in #927
This might potentially be under the same umbrella as #257

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Environment

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Possible solution and workaround

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[akphi]

Tested and this has been closed by #1295