hotfix: disable extract-css-chunks-webpack-plugin in dev mode

[clarkdo]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Fix: #4885

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #4888 into dev will decrease coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             dev    #4888      +/-   ##
=========================================
- Coverage   91.8%   91.67%   -0.14%     
=========================================
  Files         72       72              
  Lines       2405     2401       -4     
  Branches     593      593              
=========================================
- Hits        2208     2201       -7     
- Misses       179      182       +3     
  Partials      18       18

Impacted Files	Coverage Δ
packages/config/src/options.js	100% <100%> (ø)	⬆️
packages/utils/src/timer.js	96.42% <0%> (-3.58%)	⬇️
packages/utils/src/resolve.js	94% <0%> (-2.16%)	⬇️
packages/utils/src/route.js	99.17% <0%> (-0.83%)	⬇️
packages/utils/src/task.js	100% <0%> (ø)	⬆️
packages/utils/src/serialize.js	88.88% <0%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 96bab9f...a4b86dc. Read the comment docs.