fix(frontend): Fix typing for dict/dict[Any, Any] SchemaField

[kcze]

Type system complains about this entry as impossible but this code path is possible and without it some blocks are broken (e.g. Step Through Items)

Changes 🏗️

• Restore case "object" in NodeGenericInputField
• Update BlockIOKVSubSchema type, so ts type checking doesn't complain

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
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Here's the code health analysis summary for commits f481de1..e1e54d9. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success	❗ 11 occurences introduced 🎯 10 occurences resolved	View Check ↗
Python	✅ Success		View Check ↗

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[Pwuts]

So I guess the schema for Step Through Items doesn't adhere to the defined schema type? What's the schema for that block?