Refactor: Extract the setup page scripts into a separate file

[yannbf]

Maintenance task, mostly to improve the contributing experience.

📦 Published PR as canary version: 0.15.3--canary.403.aaf882b.0

✨ Test out this PR locally via:

npm install @storybook/test-runner@0.15.3--canary.403.aaf882b.0
# or 
yarn add @storybook/test-runner@0.15.3--canary.403.aaf882b.0

Version

Published prerelease version: v0.15.3-next.2

Changelog

🐛 Bug Fix

• Refactor: Extract the setup page scripts into a separate file #403 (@yannbf)
• Docs: Adds feedback form to migration documentation #402 (@jonniebigodes)
• Bump jest-playwright-preset from v3.0.1 to v4.0.0 #400 (@kemuridama)
• Improve type safety and code quality #383 (@bryanjtc @yannbf)
• Refactor: Improve internal code #378 (@bryanjtc @yannbf)

Authors: 4

• @jonniebigodes
• Bryan Thomas (@bryanjtc)
• Ryo Ochiai (@kemuridama)
• Yann Braga (@yannbf)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4087d3d) 92.05% compared to head (aaf882b) 92.05%.
Report is 2 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #403   +/-   ##
=======================================
  Coverage   92.05%   92.05%           
=======================================
  Files          15       15           
  Lines         277      277           
  Branches       72       72           
=======================================
  Hits          255      255           
  Misses         22       22           

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[github-actions]

🚀 PR was released in v0.16.0 🚀