Add generator to the retirement_year / _month columns for the monthly…

[aesharpe]

From issue #2834

The monthly data retirement dates were getting mapped to retirement_year and retirement_month instead of generator_retirement_year and generator_retirement_month in the mapping spreadsheets. Only the generator_retirement_ column is included in the metadata for the cleaned version of the generators_eia860 so all the values for retirement date from the monthly data were getting dropped.

I updated the spreadsheet to map to generator_retirement_year and generator_retirement_month which should fix the problem.

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Codecov Report

Patch and project coverage have no change.

Comparison is base (d543d4b) 88.5% compared to head (532b36a) 88.5%.
Report is 11 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #2835   +/-   ##
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  Coverage   88.5%   88.5%           
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  Files         90      90           
  Lines      10150   10150           
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  Hits        8989    8989           
  Misses      1161    1161           

Files Changed	Coverage Δ
src/pudl/metadata/dfs.py	100.0% <ø> (ø)
src/pudl/metadata/resources/ferc1.py	100.0% <ø> (ø)

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[zaneselvans]

Aye, glad it was a simple fix.

I feel like this should have raised a warning or an error somewhere in the extract step due to mismatched column names.

[zaneselvans]

I'm going to go ahead and merge this so it can be part of the builds tonight.