Align generated MermaidConfig with schema

[sidharthv96]

📑 Summary

This matches the generated MermaidConfig type with the schema.

Previously, we were removing required to make all fields optional.

Now, we're using a PartialMermaidConfig type using PartialDeep instead.

📏 Design Decisions

Few alternatives considered.

1. Use RequiredDeep internally
   Abandoned, as some types in the schema are actually undefined. So using RequiredDeep will cause runtime errors.

2. Change all fields inside schema to not have undefined.
   Abandoned as it'll be a HUGE change, pulling in default values that are scattered throughout the code. This should be done later, and this PR can be considered as the first step to remove unnecessary default variables inside the code. This would also remove the ability of the authors to actually have undefined if they wanted to in the schema.

3. Match Generated type with Schema, create fully optional type for external use.

Avoids all the problems above, we just need to coerce some test types internally, which is fine, as the test would fail if there are any issues.

Currently, there is a breaking change, that the type names differ. We can switch the names, so that MermaidConfig will be the exported type which has fully partial props.

Didn't do it now, as that would mean a larger diff, making it harder to review.

📋 Tasks

Make sure you

• 📖 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

Attention: Patch coverage is 31.50685% with 50 lines in your changes are missing coverage. Please review.

Project coverage is 5.74%. Comparing base (0326d89) to head (159d85e).
Report is 46 commits behind head on develop.

❗ Current head 159d85e differs from pull request most recent head ea7d28b

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Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5515   +/-   ##
=======================================
  Coverage     5.74%   5.74%           
=======================================
  Files          277     277           
  Lines        41967   41955   -12     
  Branches       515     515           
=======================================
  Hits          2409    2409           
+ Misses       39558   39546   -12     

Flag	Coverage Δ
unit	5.74% <31.50%> (+<0.01%)	⬆️

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

Files	Coverage Δ
packages/mermaid/src/diagram-api/detectType.ts	67.07% <100.00%> (ø)
packages/mermaid/src/utils/subGraphTitleMargins.ts	0.00% <0.00%> (ø)
packages/mermaid/src/diagram-api/frontmatter.ts	0.00% <0.00%> (ø)
packages/mermaid/src/preprocess.ts	0.00% <0.00%> (ø)
.../mermaid/scripts/create-types-from-json-schema.mts	0.00% <0.00%> (ø)
packages/mermaid/src/config.ts	51.60% <73.33%> (-0.63%)	⬇️
packages/mermaid/src/diagrams/c4/c4Diagram.ts	0.00% <0.00%> (ø)
...s/mermaid/src/diagrams/flowchart/flowDiagram-v2.ts	0.00% <0.00%> (ø)
...ages/mermaid/src/diagrams/flowchart/flowDiagram.ts	0.00% <0.00%> (ø)
packages/mermaid/src/utils.ts	41.60% <62.50%> (ø)
... and 2 more

[aloisklink]

Currently, there is a breaking change, that the type names differ. We can switch the names, so that MermaidConfig will be the exported type which has fully partial props.

👍 Maybe we can call the partial one MermaidConfig, and the one with defaults MermaidConfigWithDefaults or ConfigWithDefaults.

---

Other than figuring out how to export the partial config type to users, this PR looks okay to me.