Remove parameters for Scout APM

[edwoodward]

The ScoutAPM API has been removed from the CMS. The related parameters should be removed after the code removing ScoutAPM is released

[mwvolo]

Michael to remove from AWS after the release

[brittanyearly]

Nothing to test in Staging. Will add note for post deployment task.

[brittanyearly]

Assigning to @mwvolo to remove from AWS.