Bump Pinecone SDK to 9.0.0 in full-text-search notebook

[jennapederson]

Summary

• Bumps pinecone dependency from 9.0.0rc1 to 9.0.0 in the full-text-search notebook
• Replaces inline bird search data with a reference to the external bird-search-example repo
• Normalizes notebook cell IDs

Test plan

• Verify notebook runs end-to-end with Pinecone SDK 9.0.0
• Confirm bird search example data loads correctly from the external repo

Fixes DR-878, DR-912, DR-913, DR-914

---

Note

Low Risk
Low risk change limited to .gitignore behavior. It only affects which local files are untracked/ignored and has no runtime impact.

Overview
Updates .gitignore to ignore the bird-search-example-main directory (likely created when pulling/extracting the external bird search example), preventing it from being accidentally committed.

^{Reviewed by Cursor Bugbot for commit c6da196. Bugbot is set up for automated code reviews on this repo. Configure here.}

[jennapederson]

Merging this because the majority of the linting/review issues are non-issues. Commit hooks and linting needs adjusting.