fix(repository): fix DynamicModelCtor type to correctly preserve Props

[bajtos]

Before this change, the following code would create an instance with the type of the base model class, ignoring custom model properties:

const Product = defineModelClass<typeof Model, {name: string}>(
  Model,
  definition,
);
const p = new Product();
// p has type Model now

This patch fixes the problem by changing the order in which constructor functions are defined in DynamicModelCtor, so that the compiler always picks the constructor returning Base & Props.

I discovered this problem while reviewing #5591.

Checklist

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• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• API Documentation in code was updated
• Documentation in /docs/site was updated
• Affected artifact templates in packages/cli were updated
• Affected example projects in examples/* were updated

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