Revert "Fix sprite performance regression since retained render world (#17078)" #17123
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Objective
Fixes #17098
It seems that it's not totally obvious how to fix this, but that reverting might be part of the solution anyway.
Let's get the repo back into a working state.
Solution
Revert the recent optimization that broke "many-to-one main->render world entities" for 2d.
Testing
cargo run --example text2d
cargo run --example sprite_slice