Update ESACCI-SST cmorizer to v3.0

[LisaBock]

Description

Update ESACCI-SST cmorizer to v3.0 (daily and monthly data). I changed the ESACCI-SST data to the variable tos instead of ts because the observation field is only defined over ocean and not the whole globe like ts.

Registration at CEDA is needed for downloading the data.

Also a new custom variable tosStderr is needed (see #2470 and branch add_custom_var_tosStderr in ESMValCore).

• Closes #3705

• Link to documentation:

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Checklist

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• [x] 🛠 This pull request has a descriptive title
• [ ] 🛠 Code is written according to the code quality guidelines
• [x] 🛠 Documentation is available
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New or updated data reformatting script

• [x] 🛠 Documentation is available
• [x] 🛠 The dataset has been added to the CMOR check recipe
• [ ] 🛠 The dataset has been added to the shared data pools of DKRZ and Jasmin by the @ESMValGroup/OBS-maintainers team
• [x] 🧪 Numbers and units of the data look physically meaningful