ROTATE_INDEX, INDEX_TURNS moved to debug params

[marshallward]

The index rotation flags were incorrectly handled as model parameters,
rather than debug parameters. This patch fixes this oversight.

[codecov-io]

Codecov Report

Merging #1097 into dev/gfdl will not change coverage.
The diff coverage is 14.28%.

@@            Coverage Diff            @@
##           dev/gfdl    #1097   +/-   ##
=========================================
  Coverage     45.79%   45.79%           
=========================================
  Files           215      215           
  Lines         69484    69484           
=========================================
  Hits          31819    31819           
  Misses        37665    37665           

Impacted Files	Coverage Δ
src/core/MOM_barotropic.F90	70.80% <0.00%> (ø)
src/ice_shelf/MOM_ice_shelf.F90	0.00% <0.00%> (ø)
src/ice_shelf/MOM_marine_ice.F90	0.00% <0.00%> (ø)
src/core/MOM_forcing_type.F90	62.88% <33.33%> (ø)
src/core/MOM.F90	66.33% <50.00%> (ø)

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[Hallberg-NOAA]

I agree that these changes are the right thing to do. Because the MOM_parameter_doc files will change, there will have to be a manual update to MOM6-examples, but these are simple enough that I think we should consider doing it simulaneously with one of the other contemporaneous merges that also has changes to these files.

[marshallward]

Gaea regression test: https://gitlab.gfdl.noaa.gov/ogrp/MOM6/pipelines/10294

Regression has passed (excluding parameter verification)