Revert "Optimized inference with onnx for patchcore. (#652)"

[djdameln]

This reverts commit e965c8a.

Description

• Reverts a recent change to the Average Pooling layer of PatchCore model which caused the performance deterioration reported by some users in PatchCore results are much worth than reported #715

• Fixes PatchCore results are much worth than reported #715

Changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which refactors the code base)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• My code follows the pre-commit style and check guidelines of this project.
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• I have added a summary of my changes to the CHANGELOG (not for minor changes, docs and tests).

[ashwinvaidya17]

Thanks for investigating!

[samet-akcay]

Thanks!