CMIP7 readiness

## Overview

Track CMIP7 test case results across all diagnostic providers.

**Current approach**: fetch CMIP6 data from ESGF and convert to CMIP7 format until native CMIP7 data is available.

## ESMValTool

#519

- [x] cloud-scatterplots-clwvi-pr
- [x] enso-basic-climatology
- [x] global-mean-timeseries
- [x] regional-historical-annual-cycle
- [x] regional-historical-timeseries
- [x] regional-historical-trend
- [x] transient-climate-response
- [x] transient-climate-response-emissions
- [x] zero-emission-commitment
- [ ] climate-drivers-for-fire — tasmax data not being picked up (https://github.com/ESMValGroup/ESMValTool/issues/4343)
- [ ] cloud-radiative-effects — #653
- [ ] cloud-scatterplots-clivi-lwcre — https://github.com/esMValGroup/esMValCore/issues/2980
- [ ] cloud-scatterplots-clt-swcre — https://github.com/esMValGroup/esMValCore/issues/2980
- [ ] cloud-scatterplots-cli-ta — CMORCheckError on `cli` vertical coordinate (`alevel` standard_name)
- [ ] equilibrium-climate-sensitivity — https://github.com/esMValGroup/esMValCore/issues/2980
- [ ] enso-characteristics — CMIP6 ocean grid fixes not applied to CMIP7 data
- [ ] sea-ice-area-basic — CMIP6 ocean grid fixes not applied to CMIP7 data
- [ ] sea-ice-sensitivity — CMIP6 ocean grid fixes not applied to CMIP7 data
- [ ] climate-at-global-warming-levels — disabled, needs scenario data (ssp245)

## ILAMB

#535

- [x] gpp-wecann
- [x] gpp-fluxcom2
- [x] mrro-lora
- [x] mrsos-wangmao
- [x] csoil-hwsd
- [x] lai-avh1
- [x] nbp-hoffman
- [x] snc-esacci
- [x] burntfraction-esacci
- [x] thetao-woa2023
- [x] so-woa2023
- [x] amoc-rapid
- [x] ohc-noaa

## PMP

#526

- [x] annual-cycle
- [x] enso_tel
- [x] enso_proc
- [x] extratropical-modes-of-variability-pdo
- [x] extratropical-modes-of-variability-npgo
- [x] extratropical-modes-of-variability-nao
- [x] extratropical-modes-of-variability-nam
- [x] extratropical-modes-of-variability-pna
- [x] extratropical-modes-of-variability-npo
- [x] extratropical-modes-of-variability-sam