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[dagit] Fix divider covering the “Launch Execution” button #4370

Description

[dagit] Fix divider covering the “Launch Execution” button #4370

Summary: Fix z-index issue by moving the Launch Execution action button up out of the split panel

Test Plan: Run dagit, visit page

Reviewers: dish

Reviewed By: dish

Differential Revision: https://dagster.phacility.com/D9099