Exposing DOC_DETAILS_OTHERS_TO_KEEP for subclassers

[jamesbraza]

This let's subclasses of PQASession expand the DOC_DETAILS_OTHERS_TO_KEEP if desired

[Copilot]

Pull Request Overview

This PR refactors the DOC_DETAILS_OTHERS_TO_KEEP constant to be a class variable on PQASession, enabling subclasses to customize which document detail fields are preserved during user content filtering.

• Moved DOC_DETAILS_OTHERS_TO_KEEP from module-level constant to a ClassVar on PQASession
• Updated the filtering logic to reference the class variable instead of the global constant

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