Add pipelines tab to new MR

#### What does this MR do?
Adds pipelines tab to new MRs

#### Screenshots (if relevant)
![Screen_Shot_2016-10-10_at_10.23.27_AM](/uploads/6c3f8f2be0cf9ba7cc78f6d918307ec0/Screen_Shot_2016-10-10_at_10.23.27_AM.png)
![Screen_Shot_2016-10-11_at_8.59.45_AM](/uploads/e67577d92327eafef6f04073f3d94212/Screen_Shot_2016-10-11_at_8.59.45_AM.png)

#### What are the relevant issue numbers?
Closes #21444

See merge request !6238