Revisit codemod CLI

[dlabaj]

Upon release of v6 (or shortly after) we need to update the code mods to default to v6 code mods instead of v5.

[thatblindgeye]

Per discussion during sprint planning, we should revisit this post v6 to consider forcing flags regardless of version (i.e. no more default version, so consumers would have to pass/choose a v5 flag to upgrade from v4 to v5).