Nomogram: Disable sorting by pos/neg influence for logistic regression

[janezd]

Issue

Fixes #7039.

Description of changes

Disables sorting by positive/negative influence for logistic regression and adds tooltips.

Disabling and enabling was already half-implemented. That is, enabling. :)

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.04%. Comparing base (246474b) to head (bb54734).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7225      +/-   ##
==========================================
+ Coverage   89.03%   89.04%   +0.01%     
==========================================
  Files         335      335              
  Lines       74243    74248       +5     
==========================================
+ Hits        66099    66112      +13     
+ Misses       8144     8136       -8     

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