Convert the installer to apply the demo recipe

Marked as blocked by 📌 Add the full store demo recipe to the Composer project template Active

@rszrama when a recipe is not found in the installer's environment this option will be hidden from the installer? I would prefer that over adding commerce_kickstart_demo recipe as a dependency to commerce_kickstart profile, as we do already with commerce_demo.

This doesn't have to be postponed anymore as the branch release → of the commerce_kickstart_demo is now available.

I made the required changes to the installer to accommodate this change. I opted for making as few changes as possible so as of now:
- All the same steps are featured as in 3.x - (1) commerce_kickstart installs along with all dependencies, (2) user can configure an account, and timezone, (3) one can opt for installing a demo, now via recipe, or selected features, (4) installation of modules and/or recipes happens via batch API

Likely some tweaking would be beneficial. For example, in addition to the demo apply the newly created https://www.drupal.org/project/commerce_recipe_user_roles → which can be done in the followup.

Re:

At this time, we should remove the option to install any remaining configuration modules (that weren't part of the demo, like the basic catalog) from the installer.

@rszrama Not sure if you mean removing these features from the installer, profile, or just hiding them when demo is selected as we've already been doing for commerce_demo module.

Automatically closed - issue fixed for 2 weeks with no activity.