Updating list-ops test generic types parameters

[Shoghy]

I added and deleted generic type parameters from the list-ops exercise tests.

I did this because I was having problems compiling the code and I also noticed that several generic types were redudant, considering that the List class has a generic type like Array.

I will list 2 of the changed tests and the reasons why I added or removed the generic type parameter, the other tests were changed for the same reasons:

/*...*/
xit('list to empty list', () => {
  const list1 = List.create<number>()
  const list2 = List.create(1, 2, 3, 4)
  expect(list1.append(list2)).toEqual(list2)
})
/*...*/

In this first test I added the generic type parameter <number> to list1 so that, even though the constant list1 has no elements, TypeScript understands that it stores the same type value as list2. I did not add <number> to list2 because the type of value it stores is automatically deduced by the parameters sent in the create function.

---

/*...*/
describe('filter list returning only values that satisfy the filter function', () => {
  xit('empty list', () => {
    const list1 = List.create<number>()
    expect(list1.filter((el) => el % 2 === 1)).toHaveValues()
  })
/*...*/

In this case I understand that <number> in filter refers to the type of value that the list returned by filter will store, however this is not necessary if List has a generic type, since the returned list will store the same type of value as the original list.

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You can use [this link](https://forum.exercism.org/new-topic?title=Updating%20list-ops%20test%20generic%20types%20parameters&body=I%20added%20and%20deleted%20generic%20type%20parameters%20from%20the%20list-ops%20exercise%20tests.%0D%0A%0D%0AI%20did%20this%20because%20I%20was%20having%20problems%20compiling%20the%20code%20and%20I%20also%20noticed%20that%20several%20generic%20types%20were%20redudant,%20considering%20that%20the%20%60List%60%20class%20has%20a%20generic%20type%20like%20%60Array%60.%0D%0A%0D%0AI%20will%20list%202%20of%20the%20changed%20tests%20and%20the%20reasons%20why%20I%20added%20or%20removed%20the%20generic%20type%20parameter,%20the%20other%20tests%20were%20changed%20for%20the%20same%20reasons:%0D%0A%0D%0A%60%60%60ts%0D%0A/*...*/%0D%0Axit('list%20to%20empty%20list',%20()%20=%3E%20%7B%0D%0A%20%20const%20list1%20=%20List.create%3Cnumber%3E()%0D%0A%20%20const%20list2%20=%20List.create(1,%202,%203,%204)%0D%0A%20%20expect(list1.append(list2)).toEqual(list2)%0D%0A%7D)%0D%0A/*...*/%0D%0A%60%60%60%0D%0AIn%20this%20first%20test%20I%20added%20the%20generic%20type%20parameter%20%60%3Cnumber%3E%60%20to%20%60list1%60%20so%20that,%20even%20though%20the%20constant%20%60list1%60%20has%20no%20elements,%20TypeScript%20understands%20that%20it%20stores%20the%20same%20type%20value%20as%20%60list2%60.%20I%20did%20not%20add%20%60%3Cnumber%3E%60%20to%20%60list2%60%20because%20the%20type%20of%20value%20it%20stores%20is%20automatically%20deduced%20by%20the%20parameters%20sent%20in%20the%20%60create%60%20function.%0D%0A___%0D%0A%0D%0A%60%60%60ts%0D%0A/*...*/%0D%0Adescribe('filter%20list%20returning%20only%20values%20that%20satisfy%20the%20filter%20function',%20()%20=%3E%20%7B%0D%0A%20%20xit('empty%20list',%20()%20=%3E%20%7B%0D%0A%20%20%20%20const%20list1%20=%20List.create%3Cnumber%3E()%0D%0A%20%20%20%20expect(list1.filter((el)%20=%3E%20el%20%25%202%20===%201)).toHaveValues()%0D%0A%20%20%7D)%0D%0A/*...*/%0D%0A%60%60%60%0D%0AIn%20this%20case%20I%20understand%20that%20%60%3Cnumber%3E%60%20in%20%60filter%60%20refers%20to%20the%20type%20of%20value%20that%20the%20list%20returned%20by%20%60filter%60%20will%20store,%20however%20this%20is%20not%20necessary%20if%20%60List%60%20has%20a%20generic%20type,%20since%20the%20returned%20list%20will%20store%20the%20same%20type%20of%20value%20as%20the%20original%20list.&category=typescript ) to copy this into a new topic on the forum. If we decide the PR is appropriate, we'll reopen it and continue with it, so please don't delete your local branch.

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[Shoghy]

@SleeplessByte Tagging you since you requested it here