Editorial: Simplify algorithms by using strings rather than Lists

[gibson042]

Ref https://github.com/tc39/proposal-regex-escaping/issues/58#issuecomment-2023453535

[ljharb]

To me this really isn't simplified - using lists is much cleaner and easier to understand to me than continually mutating a string.

I'll defer to the @tc39/ecma262-editors, though.