Copy `filter_projects` helper to V3
Copy `filter_projects` helper to V3

The helper will be modified in V4, so copy the original to V4 to keep the
current behavior in V3.

dreampet/gitlab,iiet/iiet-git,jirutka/gitlabhq,axilleas/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq,stoplightio/gitlabhq,dplarson/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,dreampet/gitlab,t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,t-zuehlsdorff/gitlabhq,dreampet/gitlab