Make sure all instances of PartitionComponent come from the pool #2833
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What does this PR change?
Make sure all instances of PartitionComponent come from the pool and return to it. This fixes a memory leak where VolatileScenePointers creates a new instance of PartitionComponent instead of taking one from the pool, and then later ReleaseReferenceComponentsSystem adds it to the pool. The pool receives components it did not create and grows endlessly.
Unit tests are exempt.
This change is one part of a series of changes to address #2694. It is turning out to be such a rabbit hole, so I'm splitting my work up into multiple pull requests.
How to test the changes?
The game should behave exactly the same as without this change.
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