Re-add ignore_column for import columns
Re-add ignore_column for import columns

This `ignore_column` was present for a while but recently removed, but
to ensure we don't get error 500s let's keep it for a while.

stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq