remove_dual function

[KnutAM]

ForwardDiff.value, and especially Tensors._extract_value, are not exported / public API.
(Note Ferrite-FEM/Tensors.jl#208 that proposes to make Tensors.extract_value a public function).

Instead of recommending users of FerriteAssembly to use these, it is better to provide a function for common input types (Numbers and AbstractTensors)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.68%. Comparing base (61d9a88) to head (cd8a834).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   98.76%   97.68%   -1.08%     
==========================================
  Files          28       29       +1     
  Lines         970      994      +24     
==========================================
+ Hits          958      971      +13     
- Misses         12       23      +11     

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