Fix compats, add downgrade action, remove unused dependencies #3276
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The compats in ClimaAtmos were largely wrong. In this commit, I fix them. I also add a new action that checks that our tests pass with the oldest possible combination of packages that is advertised to be compatible with ClimaAtmos.
Since we required ClimaComms 0.6, I also removed all the checks on that version for the import_required_backends.
In the process, I also removed dependencies that were not required.