Expand memory leak testing to all packages

[RaananW]

At the moment we are testing memory leaks with a few predefined scenes.

A better test would be a fully featured scene including interactions. Something similar to Hill Valley after moving, opening the inspector etc', using a loading screen and so on.

Note - as it takes roughly 50-60 seconds all in all to run a single mem-leak test we need to be careful with the amount of tests we are running

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