old grad tests need rework

[dehann]

Todos:

• fix naming gradients vs jacobian
• correct dispatches for residuals or norms see Use CalcFactorNormSq as functor #1786
• salvage any value from these older "gradients" tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                      Coverage Diff                      @@
##             23Q2/test/restore3alttests    #1792   +/-   ##
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  Coverage                              ?   53.08%           
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  Files                                 ?       80           
  Lines                                 ?     5934           
  Branches                              ?        0           
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  Hits                                  ?     3150           
  Misses                                ?     2784           
  Partials                              ?        0           

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