CLI: Install should include a production flag

The CLI `build --production` command installs dev Composer deps because the install command does not have a production flag.

#### Steps to reproduce the issue

1. jetpack build -v --production plugins/boost

#### What I expected

Only the prod composer deps installed.

#### What happened instead
I can see all of the composer deps installed, then they're removed (by the build command, which accepts a production flag).

**Screenshots**
If applicable, add screenshots to help explain your problem.

Start by tracing the CLI path used by `jetpack build -v --production plugins/boost` and the install command that currently installs Composer development dependencies. Done means the install command accepts and honors a production flag so development dependencies are not installed and later removed.

Written by the indexing model from the issue text.