[CT-1985] Lazily call version in click params

[stu-k]

As part of the work in #6802 we use click.version_option, however the eagerly calls dbt.version.get_version_information which in turn calls our legacy flags module. This presents a problem since we want that module to only be loaded after our click group has run. This work should prevent dbt.version.get_version_infromation from being called before the click group as executed. Likely go back to using version as a click.option and use the callback arg.