fix(pdf-reader): prevent local Path casting for remote s3 URIs to fix crash

[spideyashith]

Description

This PR addresses an issue where PDFReader forcefully casts remote cloud URIs (like s3://) into local Path objects, which strips the URI formatting and crashes the reader.

Fixes:

• Added a check to skip local Path casting if the file variable is a remote URI string.
• Updated the metadata extraction block to safely grab the file name regardless of whether the file is a Path object or a string.

Fixes #15406

New Package?

• Yes
• No

Version Bump?

• Yes
• No

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• 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

How Has This Been Tested?

• I added new unit tests to cover this change
• I believe this change is already covered by existing unit tests

Suggested Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added Google Colab support for the newly added notebooks.
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I ran uv run make format; uv run make lint to appease the lint gods

[spideyashith]

"Hi @logan-markewich , I've implemented the fix for the S3 Path casting crash. Could you please approve the CI workflows to run? I've verified the fix locally on Windows."