Feature/4060 gantt working hours

[80avin]

📑 Summary

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Resolves #4060

📏 Design Decisions

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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.
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commit: 6f32ce1

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 12 lines in your changes missing coverage. Please review.

Project coverage is 4.59%. Comparing base (df636c6) to head (6f32ce1).

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/gantt/ganttDb.js	84.21%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6149      +/-   ##
==========================================
+ Coverage     4.48%   4.59%   +0.10%     
==========================================
  Files          383     383              
  Lines        54038   54110      +72     
  Branches       596     605       +9     
==========================================
+ Hits          2425    2486      +61     
- Misses       51613   51624      +11     

Flag	Coverage Δ
unit	4.59% <84.21%> (+0.10%)	⬆️

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

Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/gantt/ganttDb.js	78.06% <84.21%> (+0.58%)	⬆️

[zkhin]

Please add necessary unit and e2e tests, we especially want to make sure caches are invalidated appropriately, but that might be a separate issue from this PR.