Moved stage1 plugin into production

[noisecapella]

What are the relevant tickets?

What's this PR do?

• Moves the stage1 babel requirement from devDependencies to dependencies so production builds can use it
• Adds --bail to webpack command so it returns a non-zero status code on error (surprisingly not the default behavior)

Where should the reviewer start?

How should this be manually tested?

Any background context you want to provide?

Screenshots (if appropriate)

What GIF best describes this PR or how it makes you feel?

[giocalitri]

details for the change in webpack_if_prod.sh?

[noisecapella]

The --bail command causes webpack to exit with a non-zero code if there's an error. Since it didn't do this before we were unaware of the requirements error. Some context: webpack/webpack#708 (comment)

[giocalitri]

then it is 👍