Update the DMPTool so that it communicates with v2

[briri]

Update the DMPTool so that it can communicate with the new v2 system.

• [ ] Make necessary changes to the app/services/external_apis/dmphub.rb service
• [ ] Update the SSM credentials

[briri]

Closing in favor of https://github.com/CDLUC3/dmptool/issues/384