Update REF ENSO recipes for CMIP7

[flicj191]

recipes:

• ref/recipe_enso_basicclimatology_CMIP7.yml
• ref/recipe_enso_characteristics_CMIP7.yml

updates:

• update to reading CMIP7 data
• update enso diagnostic scripts to include CMIP7 for models
• update pr obs to GPCPv3.3

Still required:

• waiting on v2 of TROPFLUX that will extend to 2025 for variables tos and tauu
• could use another dataset such as ERSSTv5 (tos) or NCEP-DOE-R2 (tauu)?

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