[ao] maintain BC for is_activation_post_process (#89260)
Summary: tests are failing due to code packaged with trained models calling now defunct function names (is_activation_post_process).
this diff maintains BC temporarily until the cached code can be refreshed
Test Plan: no functional change
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/89260
Approved by: https://github.com/jerryzh168
