fix(types): adjust legacy types for eslint-plugin-svelte

[mcous]

When using @testing-library/svelte@5.2.x with Svelte 4, wrapping render can cause spurious @typescript-eslint/no-unsafe-argument errors. I suspect this is due to some sort of bug in eslint-plugin-svelte, but I have not yet produced a minimal reproduction.

import type { ComponentProps } from 'svelte';
import { render } from '@testing-library/svelte';

import Subject from '../app.svelte';

const renderSubject = (props: ComponentProps<Subject>) => {
  return render(Subject, props);
};

error  Unsafe argument of type `any` assigned to a parameter of type `SvelteComponentOptions<SvelteComponent<Record<string, any>, Record<string, any>, Record<string, any>>> | undefined`  @typescript-eslint/no-unsafe-argument

In the meantime, this PR

• Adjusts the types so that ESLint does not get mad
• Adds a failing test case to the types suite

[github-actions[bot]]

:tada: This PR is included in version 5.2.5 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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