[fix] Pytests Plots

[SimonWittner]

🔬 Background

• During testing some plots opened.

🔮 Key changes

• Built-in plotting in conformal_predict disabled when running pytests.

📋 Review Checklist

• I have performed a self-review of my own code.
• I have commented my code, added docstrings and data types to function definitions.
• I have added pytests to check whether my feature / fix works.

[codecov]

Codecov Report

Merging #1445 (f9d314c) into main (583e15b) will decrease coverage by 1.59%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1445      +/-   ##
==========================================
- Coverage   89.91%   88.32%   -1.59%     
==========================================
  Files          38       38              
  Lines        5097     5097              
==========================================
- Hits         4583     4502      -81     
- Misses        514      595      +81     

see 4 files with indirect coverage changes

[ourownstory]

Great work