Over 6 months ago, we deprecated the force_to_redownload column on
these five Geo tracking database tables:

design_management_repository_registry
group_wiki_repository_registry
project_repository_registry
project_wiki_repository_registry
snippet_repository_registry

This commit takes the next step and adds a post migration to
remove the column from these tables in 16.10.

Changelog: removed
EE: true