Add debug GPU CI as user-requested option

[sbryngelson]

Long been thinking about this. We can enable all the debug options for the GPU CI cases, then have them run with a manual trigger as the user needs it.

This would provide a couple of few things...

• it would show the user how to debug their code because they could look at what options we use on different hardware/computers.
• It would also allow easy debugging on systems the user doesn't have access to.
• It would also track (hopefully!) the best debugging practices available via our command line options + environment variables (related to Add OpenACC/OMP debugging info to docs #918)

[sbryngelson]

changed my mind about this