make tests GPU-compatible

[juliasloan25]

Pursuing the goal of making the coupler entirely GPU-compatible, we should make sure our tests pass on GPU. part of #390

Current status

passes on GPU?

• [x] aqua
• [x] interfacer
• [ ] regridder - not planned
• [x] conservation checker
• [ ] bcreader - not planned
• [x] utilities
• [x] time manager
• [x] field exchanger
• [ ] flux calculator
• [ ] diagnostics
• [ ] postprocessor
• [x] checkpointer
• [ ] coupled_sims experiment test - not planned
• [x] leaderboard
• [x] bucket component test
• [x] atmos component test
• [x] prescribed sea ice component test
• [ ] eisenman sea ice component test - not planned
• [x] slab ocean component test
• [x] AMIP debug plots

To do

fixed by removing bycolumn

• [ ] flux_calculator_tests.jl
  • uses bycolumn - get_field method not found

other

• [ ] diagnostics_tests.jl
  • args to operation not isbits - FieldVector?
• [x] debug_amip_plots.jl
  • plotting not GPU compatible
  • might work after applying changes from https://github.com/CliMA/ClimaCoupler.jl/pull/614/files#diff-f01ec1107a04223a7409af03497ce828cdf644af9d40d69a8110831c2142cf27R51-R83

not planned to make GPU-compatible

• [ ] eisenman_seaice_tests.jl
  • planned to be used for academic exercises rather than final coupled model, so GPU compatibility isn't necessary
• [ ] regridder_tests.jl
  • will be fixed by ClimaUtilities switch
• [ ] bcreader_tests.jl
  • will be fixed by ClimaUtilities switch
• [ ] postprocessor_tests.jl
  • NCDataset write (calls Regridder)
• [ ] coupledsims experiment test
  • CC.Operators.LinearRemap uses scalar indexing
  • will require change in ClimaCore, or different remapping

Remaining roadblocks

• use of bycolumn
  • flux_calculator_tests
• file writing
  • diagnostics, checkpointer

### modify tests for GPU compatibility
- [ ] https://github.com/CliMA/ClimaCoupler.jl/issues/748
- [ ] https://github.com/CliMA/ClimaCoupler.jl/issues/736
- [ ] https://github.com/CliMA/ClimaCoupler.jl/issues/750

### use ClimaUtilities for GPU compatibility
- [ ] https://github.com/CliMA/ClimaCoupler.jl/issues/425
- [ ] https://github.com/CliMA/ClimaCoupler.jl/issues/742