add scratch dir to gitignore

[d-chambers]

Description

This simple PR adds a .scratch directory to the gitignore.

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings and/or appropriate doc page.
• included tests. See testing guidelines.
• added the "ready_for_review" tag once the PR is ready to be reviewed.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3127408e-222f-4091-a6ea-d170a985d090

📥 Commits

Reviewing files that changed from the base of the PR and between bab9f84 and 52d25af.

📒 Files selected for processing (1)

• .gitignore

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add_scratch

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