FIX: Exposed file format in plot_animated_field function

[eblanco-ansys]

Description

Exposed file format in plot_animated_field function

Issue linked

#6350

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.36%. Comparing base (a1e253b) to head (d418683).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6353      +/-   ##
==========================================
+ Coverage   85.35%   85.36%   +0.01%     
==========================================
  Files         175      175              
  Lines       65797    65797              
==========================================
+ Hits        56162    56170       +8     
+ Misses       9635     9627       -8     

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