Change new pipeline to run pipeline

## What does this MR do?
Change text of button from `New pipeline` to `Run pipeline`

## What are the relevant issue numbers?
Closes #18935    
Part of  #18920 

## Screenshots (if relevant)
![Screen_Shot_2016-07-06_at_12.15.36_PM](/uploads/2e0413b802118781dc5a29c7f1c105b8/Screen_Shot_2016-07-06_at_12.15.36_PM.png)

See merge request !5119