[Impeller] Improve `AiksLayer::IsReplacing`

[dnfield]

We should do the following:

• Collect statistics similar to DisplayListLayer
• Do a deeper comparison of the EntityPass if the pointers do not actually match, at least to a certain point - for example, DisplayListLayer will compare DLs of up to 10kb. EntityPass is potentially more expensive to compare right now though.

[jonahwilliams]

We decided not to proceed with the AiksLayer approach. Closing for now.

[github-actions]

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