No error on super. for inferred class properties in JavaScript

[DanielRosenwasser]

In #54056 we added checks for class fields; however, we don't issue the same error in JavaScript for properties inferred from assignments.

// @ts-check

class YaddaBase {
    constructor() {
        this.roots = "hi";
    }
}

class DerivedYadda extends YaddaBase {
    get rootTests() {
        return super.roots; // no error?
    }
}

console.log(new DerivedYadda().rootTests); // prints undefined!

Originally posted by @DanielRosenwasser in #55883 (comment)