Fabricate CMIP7 coverage by repeating the final year

[lewisjared]

Reworks how fabricated CMIP7 test data reaches years the CMIP6 source never ran. The series used to be relabelled onto the requested end date, which dragged every real year along with it. It is now padded instead, by repeating the final year until it reaches that date, so the real timesteps keep their real dates and values.

Two things worth a close look.

• The relabelling was applied per file, so a dataset split into chunks (GFDL-ESM4 toz is 1850-1949 plus 1950-2014) produced overlapping files that all ended on the same month. Padding only ever touches the tail, so that goes away.
• The fabricated tail is now a repeat of the last real year rather than real data under a different label. Either way it is invented, but a reviewer should be happy with a flat repeated year showing up in the fire and cloud radiative effects plots.

Re-mints the two affected CMIP7 baselines. Their fabricated files move from 185701-202112 to 185001-202112.

The ozone diagnostics need this to ask for a 1950 start on CMIP7, so #886 should land after it.

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[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...limate-ref-core/src/climate_ref_core/esgf/cmip7.py	0.00%	1 Missing ⚠️

Flag	Coverage Δ
core	93.76% <95.83%> (+<0.01%)	⬆️
providers	87.70% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...te-ref-core/src/climate_ref_core/cmip6_to_cmip7.py	94.49% <100.00%> (+0.14%)	⬆️
...esmvaltool/diagnostics/climate_drivers_for_fire.py	100.00% <ø> (ø)
...limate-ref-core/src/climate_ref_core/esgf/cmip7.py	87.30% <0.00%> (ø)

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