Build: Add installScripts step in bootstrap command

[yannbf]

Issue: N/A

What I did

A few things:

• The dependencies from the scripts folder are now updated as a prerequisite of the install step from the bootstrap command. This will happen when running yarn bootstrap --core or yarn bootstrap --install
• The bootstrap command now gracefully handles quitting with CTRL+C
• Some scripts were updated as a result of this change
• Small documentation was updated

How to test

You can remove node_modules from code and scripts then run:

./bootstrap --core

and everything should be good to go.

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[shilman]

LGTM! Thanks @yannbf 👏

[tmeasday]

Ok, this is great, although we should be aware we are likely going to to drop bootstrap entirely as part of #19275 (which is still in progress). Perhaps we can look at that together soon @yannbf