Support Terraform provisioning in Workflows

[kbrock]

Enable terraform provider support to workflows.

Ensure it works for generic services and terraform provision workflows.

Workflow execute task does not work for terraforms which is based upon services.

• [WIP] Add terraform catalog entry point selection manageiq-ui-classic#9223
• Update documentation for getting standard terraforms working for developers
• Update UI to define a terraform workflow endpoint
• Update builtin to support Terraform Provisioning Task

[miq-bot]

This issue has been automatically marked as stale because it has not been updated for at least 3 months.

If you can still reproduce this issue on the current release or on master, please reply with all of the information you have about it in order to keep the issue open.