Handle --prod deprecation more gracefully

[drullo]

🚀 Feature request

Command

• update

Description

--prod has been deprecated for ng build. However, I would think that most apps probably have build/deploy automation scripts configured in package.json, which will be affected by this change.

Describe the solution you'd like

I would like to see ng update automate the change of package.json scripts so that --prod is automatically changed to --configuration production.

Describe alternatives you've considered

The alternative is disruptive and painful for the end user... Either manually updating every single project, or developing our own automated process - resulting in varying experiences.

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