kokkos test support older kokkos

[Yurlungur]

PR Summary

@ktsai7 pointed out a test was failing on Power9s. @rbberger found that the reason was that we are using an older Kokkos on that system, and it doesn't support cuda-relaxed-constexpr. The test relied on this to move a std::array to device via lambda capture.

This change removes the need for that, by instead using a Kokkos::View. I also got annoyed waiting for 1e9 points to be evaluated, so I reduce to 1e6 points.

PR Checklist

• [x] Code is formatted.
• [x] Adds a test for any bugs fixed. Adds tests for new features.

[Yurlungur]

I also clean up formatting a bit.