The new `Orchestration::Templates` class verifies the host's readiness for the provisioning process and checks that all default os templates are renderable.

The `Orchestration::TFTP` was handling this use case partially, only for ['PXELinux', 'PXEGrub2', 'PXEGrub', 'iPXE'] kinds, leaving other template kinds from the list.

• Foreman + Smart Proxy, provisioning setup
• Assign PXELinux, PXEGrub2, and Kickstart Default templates to OS
• Ensure the Kickstart Default cannot be rendered (for example, with invalid Ruby syntax).
• Provision a host