Split shareable functionality into reusable components (chef-core)

[marcparadise]

Description

This PR splits out some of the underlying behaviors of chef-apply into reusable components, with a goal of sharing it across both existing and new components in the Chef ecosystem.

This resulted in two gems, both in the repository chef-core. The files deleted from this repository can be found in chef-core; history has been retained.

• chef-core - i18n, connectivity, shared error handling behaviors, telemetry (via chef-telemetry).
• chef-core-actions - self-contained actions that perform common behaviors such as installing chef on a remote node or converging with chef-client.

This PR completes the switchover to using chef-core and chef-core-actions. Files removed here can now be found with history in https://github.com/chef/chef-core.

Check List

• [x] New functionality includes tests
• [x] All tests pass
• [x] PR title is a worthy inclusion in the CHANGELOG
• [ ] You have locally validated the change (Currently re-validating now that bootstrap is winding down)

[tyler-ball]

It sounds like we're moving the telemetry work into the chef-telemetry gem to prevent circular dependencies in some of our projects.

Lets decide if we still want to separate out these gems or if we want to close this card.

[tyler-ball]

Closing this out since no other projects are using chef-core. We need to examine if this repo is still useful.