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

❗ No coverage uploaded for pull request base (23Q2/test/restore3alttests@b767914). Click here to learn what that means.
The diff coverage is n/a.

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##             23Q2/test/restore3alttests    #1792   +/-   ##
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