Import gtfn backends exposed by next module (cached version)

[edopao]

Replace GTFN backend with the GTFN-cached backend exposed by gt4py.next module.

[edopao]

@havogt The icon-exclaim CI fails with error:
AttributeError: 'GTFNTranslationStep' object has no attribute 'generate_stencil_source'

Do you think this could be caused by the GTFN-cached backend? This PR is only modifying the pytest config, as far as I understand.

[edopao]

launch jenkins icon

[edopao]

@havogt The icon-exclaim CI fails with error: AttributeError: 'GTFNTranslationStep' object has no attribute 'generate_stencil_source'

Do you think this could be caused by the GTFN-cached backend? This PR is only modifying the pytest config, as far as I understand.

The last 2 commits revert the GTFN backend to use explicit classes. I wanted to run the icon-exclaim CI with the baseline backend (non-cached GTFN-backend). The CI still fails, with the same error, so it looks like an issue in baseline.

[github-actions]

Mandatory Tests

Please make sure you run these tests via comment before you merge!

• cscs-ci run default
• launch jenkins spack

Optional Tests

To run benchmarks you can use:

• cscs-ci run benchmark

In case your change might affect downstream icon-exclaim, please consider running

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For more detailed information please look at CI in the EXCLAIM universe.

[edopao]

launch jenkins spack

[edopao]

cscs-ci run default

[edopao]

cscs-ci run benchmark