Fix: rename and correct GitHub Actions workflow for first interaction

[devanshu-puri]

Title: Fix: rename and correct GitHub Actions workflow

Description: Renamed greetings.yml to first-interaction.yml and fixed input key names to resolve workflow failure.

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[!IMPORTANT]

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• .github/workflows/first-interaction.yml

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✨ Finishing touches

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

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