[Merged by Bors] - Add "end of main pass post processing" render graph node #6468
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Objective
Bevy UI (and third party plugins) currently have no good way to position themselves after all post processing effects. They currently use the tonemapping node, but this is not adequate if there is anything after tonemapping (such as FXAA).
Solution
Add a logical
END_MAIN_PASS_POST_PROCESSING
RenderGraph node that main pass post processing effects position themselves before, and things like UIs can position themselves after.