Remove tooltips from build nodes

Before:   
<img src="/uploads/48441dccfe39c5eb1da3dbb9a26e6bd2/Screen_Shot_2016-10-26_at_2.43.46_PM.png" width="400px">
After:   
<img src="/uploads/d72b2ad4603c964283e155e5a2b053fe/Screen_Shot_2016-10-26_at_2.43.31_PM.png" width="400px">
Closes #23868

See merge request !7128