Fix overflow scroll on event config panel

[djfarrelly]

Description

This now ensures the sidebar scrolls if there is overflow.

Motivation

Bug report: https://inngest.slack.com/archives/C069Q14GKC5/p1713303280970129

Type of change (choose one)

• Chore (refactors, upgrades, etc.)
• Bug fix (non-breaking change that fixes an issue)
• Security fix (non-breaking change that fixes a potential vulnerability)
• Docs
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist

• I've linked any associated issues to this PR.
• I've tested my own changes.

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Name	Status	Preview	Comments	Updated (UTC)
ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 16, 2024 10:14pm