Address `@ts-expect-error`

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Address occurrences of @ts-expect-error.

Then make this change in function-builder/package.json and function-builder-basics/package.json:

-              "ts-expect-error": "allow-with-description",
+              "ts-expect-error": true

Related to #158.

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Unassigning until work on this sim resumes.

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For this one in RationalNumber.ts:

    // @ts-expect-error bigRat is a global created by preloading BigRational.js.
    this.bigRational = bigRat( numerator, denominator );

@samreid said in Slack#developer:

As described in peterolson/BigRational.js#27, BigRational does not provide type definitions, so as long as we are loading as a preload we will not get good type information for it.

So that @ts-expect-error will be permanent, and package.json will therefore need to keep:

"ts-expect-error": "allow-with-description"

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For this one in OutputCardsCarousel:

        // @ts-expect-error getContents should return CardNode[] for CardContainer.
        cardNode.moveToInputCarousel();

... the fix is to parameterize MovableContainer, like this:

export default class MovableContainer extends Node {
export default class MovableContainer<T extends FBMovableNode> extends Node {

But that requires converting CardContainer and FunctionContainer to TypeScript, which has other challenges.