Fixing Settings.get_index_name being the same for different PDF parsers

[jamesbraza]

If we are using a PyPDF-based vs a PyMuPDF-based parser, the autogenerated index names should not clobber each other.

[Copilot]

Pull Request Overview

This PR fixes an issue where different PDF parsers (PyMuPDF vs PyPDF) would generate the same index name, causing them to clobber each other's cached parsing results.

• Added the PDF parser function as a parameter in index name generation to ensure uniqueness
• Added a test to verify that different parsers produce different index names

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/paperqa/settings.py	Modified get_index_name method to include the PDF parser function in the index name calculation
tests/test_paperqa.py	Added test case to verify different PDF parsers generate unique index names

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