ignore -> ignore_derivatives

[benedict-96]

Replaced ignore with ignore_derivatives (see #85).

I'm also not quite sure why we need this routine, because ignore_derivatives does as the name suggests only compute the forward pass while not outputting the pullback; it should be equivalent to simply calling the function: https://github.com/JuliaDiff/ChainRulesCore.jl/blob/83366a5b2a1415dcae9b39521ae4c8b887bb0d5c/src/ignore_derivatives.jl#L8

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (d42e956) 68.27% compared to head (a29444f) 68.27%.

Files	Patch %	Lines
src/training_method/variational_method.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #108   +/-   ##
=======================================
  Coverage   68.27%   68.27%           
=======================================
  Files          96       96           
  Lines        2440     2440           
=======================================
  Hits         1666     1666           
  Misses        774      774           

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