[Themes] Add CLI environment configuration to exported pull, push, and findOrSelectTheme

[jamesmengo]

WHY are these changes introduced?

Fixes https://github.com/Shopify/develop-advanced-edits/issues/356

WHAT is this pull request doing?

Implements CLI environment configuration for programatic invocation of theme push, theme pull, and findOrSelectTheme

How to test your changes?

To test these changes:

• Modify the value of options.verbose or options.noColor and run the command WITHOUT the flag
• You should see the desired effects.

Post-release steps

No post-release steps are required for this change.

Measuring impact

How do we know this change was effective? Please choose one:

• [x] n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• [ ] Existing analytics will cater for this addition
• [ ] PR includes analytics changes to measure impact

Checklist

• [ ] I've considered possible cross-platform impacts (Mac, Linux, Windows)
• [ ] I've considered possible documentation changes