Using a custom version of the node typings is causing a lot of pain while trying to upgrade our build to use `@types` instead of the `d.ts` files we have to maintain. I believe we primarily maintain our own version for two reason:

- Custom require function
- setTimeout and other timer functions return NodeJs.timer instead of a number

These can both be delt with, the first by using interface augmentation and the second by switching to use any types for timer. I believe that the pain of maintaining our own node `d.ts` outweighs the benefits here

This change switches us to use the standard @types/node package for our node typings

This reverts commit 73363f61.

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

This part removes most `use strict` directives that are right after the file header

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

We set alwaysStrict so this directive is not needed

Standardizing syntax and discouraging use of `this` inside tests

Adding todo about addressing this

Fixes #59757