Bug 1093273: support remove-project tags r=pmoore
Bug 1093273: support remove-project tags r=pmoore

we'll also error out on unsupported tags in the future

simar7/build-mozharness,mrrrgn/build-mozharness,lissyx/build-mozharness,armenzg/build-mozharness,mrrrgn/build-mozharness,mozilla/build-mozharness,lissyx/build-mozharness,walac/build-mozharness,mozilla/build-mozharness,armenzg/build-mozharness,walac/build-mozharness,simar7/build-mozharness