Switch to all-at-once approach for 'toss3' builds on 'serrano' (TRIL-200, #2699)

Created by: bartlettroscoe

Now that the new testing-vm.sandia.gov site is sending out emails, I think this is a safe thing to do. I am hoping this will help to avoid timeouts in the sbatch command running the tests on 'serrano'.

I did not test this. But this was a copy-and-paste from the other driver scripts for 'white'/'ride' that was tested and it is an extremely safe change.

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