fix: handle static arrays with Mooncake

[gdalle]

Fixes #642

DI ext

• Mooncake: refine copyto!! to use the check DI.ismutable_array

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.53%. Comparing base (cc8818a) to head (fbc1a1a).

Files with missing lines	Patch %	Lines
...MooncakeExt/DifferentiationInterfaceMooncakeExt.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #643   +/-   ##
=======================================
  Coverage   97.53%   97.53%           
=======================================
  Files         111      111           
  Lines        5550     5550           
=======================================
  Hits         5413     5413           
  Misses        137      137           

Flag	Coverage Δ
DI	98.65% <0.00%> (ø)
DIT	95.35% <ø> (ø)

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