Replaces many loops of the form:

```js
for (let i = 0; i < elements.length; ++i) {
    const i = elements[i];
   ...
}
```

with:

```js
for (const element of elements) {
    ...
}
```

Mix of a horrible regex based find/replace and manual touch ups

related to #63897

related to #62716

In these cases, the programmer has explicitly indicated that the type should be nullable

We compile using the alwaysStrict flag so these directives are not needed.

This part removes most of the remaining use strict directives that were not caught by part 1 and 2

We compile using the alwaysStrict flag so these directives are not needed