wip: mermaid image size zero

[bonyuta0204]

📑 Summary

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Resolves #

📏 Design Decisions

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📋 Tasks

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• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• 🔖 targeted develop branch

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[codecov]

Codecov Report

Merging #5058 (0e8ea99) into develop (4a4e614) will increase coverage by 36.78%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #5058       +/-   ##
============================================
+ Coverage    42.91%   79.69%   +36.78%     
============================================
  Files           23      164      +141     
  Lines         5029    13870     +8841     
  Branches        21      698      +677     
============================================
+ Hits          2158    11054     +8896     
+ Misses        2870     2666      -204     
- Partials         1      150      +149     

Flag	Coverage Δ
e2e	85.69% <100.00%> (?)
unit	42.91% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
packages/mermaid/src/dagre-wrapper/shapes/util.js	96.29% <100.00%> (ø)

... and 159 files with indirect coverage changes