Disease hierarchy node tooltip display - fix

[varun-divya]

Related issues

• Closes Disease hierarchy display #1214

Summary

• adds ...
• changes ...
• fixes ...
• removes ...

Checks

• All tests have passed (or issues created for failing tests)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.84%. Comparing base (c43ebe6) to head (4cb3bd9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1216   +/-   ##
=======================================
  Coverage   71.84%   71.84%           
=======================================
  Files          92       92           
  Lines        3232     3232           
=======================================
  Hits         2322     2322           
  Misses        910      910           

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[sagehrke]

Approved!