This will act as a cache, otherwise we would need to load the
`term_agreements` for a user on each request.

Using this field the result we're interested in is loaded when the
current user is loaded, without causing an extra query.

That way we can link a users acceptance of terms directly to a terms record.

Add a flag to applications settings to enforce users to accept terms
before using the GitLab instance

* processes any pending records which are not migrated yet
* bumps import_export version because of new commits_count attribute
* removes commits_count fallback method

Cleans merge request css