[Infrastructure] Figure out a process to reliably update our JS tooling and dependencies on a regular cadence

[javiercn]

We currently don't have a process in place to update our JS dependencies in the same way we update other dependencies. This makes these dependencies go stale and makes it harder to update later on, as well as prevents us from reaping benefits that new versions normally bring.

We want to have a process for updating things like Webpack and Typescript on a regular basis so that we can leverage new features and target more modern JavaScript.

It would be ideal if we can centralize the versions of these things in one place as well as if we upgrade other dependencies like yarn (currently using 1.13, 2.0 has been out for a while).

[mkArtakMSFT]

@javiercn isn't this done already?

[En3Tho]

Not sure if JS and "reliably" can be really figured out.