Complete CCPPization of UW shallow convection (uwshcu)

[jimmielin]

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(Helpful git command: git diff --name-status development...<your_branch_name>)

If there are new failures (compared to the test/existing-test-failures.txt file),
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diff. What is the nature of the change? Roundoff?

derecho/intel/aux_sima:

derecho/gnu/aux_sima:

derecho/nvhpc/aux_sima (test is run via Github workflow. Only run the test manually if we need to save new baselines):

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