Revert "Update the iso_contours example using iso_surfaces operator"

[MichaelNale]

Reverts #1164

[PProfizi]

Necessary due to incompatibility between this new version of the example and DPF 2024.1.pre0.
This PR should be revert itself once ansys-dpf-core for DPF 2024.1.pre1 is under preparation.
@rafacanton to keep you updated

[codecov]

Codecov Report

Merging #1203 (1ec6c57) into master (7ad9470) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1203      +/-   ##
==========================================
+ Coverage   87.28%   87.37%   +0.09%     
==========================================
  Files          81       81              
  Lines        9224     9231       +7     
==========================================
+ Hits         8051     8066      +15     
+ Misses       1173     1165       -8     

[rafacanton]

@PProfizi I don't understand. Wouldn't it be better to just mark it as limited to versions >=7.1?

[PProfizi]

@rafacanton sadly no, since it already appears in the doc in its older version, we can't just bump the required version to a DPF verion that is not released yet. The point is we don't want to it disappear upon the release of a new ansys-dpf-core, which is what would happen if we mark it as requiring a higher DPF version than what is currently available.

[PProfizi]

When generating the doc, we filter out the examples that require a DPF version superior to what is being used to generate the doc.