Avoid drawing intron subfeatures for gene glyphs

[cmdcolin]

Fixes #2735

Uses a heuristic that doesn't draw introns only if the feature is a subfeature

[codecov]

Codecov Report

Merging #2849 (1ac6564) into main (b11ba74) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2849      +/-   ##
==========================================
- Coverage   59.90%   59.88%   -0.02%     
==========================================
  Files         584      584              
  Lines       26528    26529       +1     
  Branches     6443     6445       +2     
==========================================
- Hits        15892    15888       -4     
- Misses      10322    10327       +5     
  Partials      314      314              

Impacted Files	Coverage Δ
...gins/svg/src/SvgFeatureRenderer/components/Box.tsx	100.00% <100.00%> (ø)
packages/core/TextSearch/TextSearchManager.ts	96.55% <0.00%> (-3.45%)	⬇️
...inearGenomeView/components/RefNameAutocomplete.tsx	77.77% <0.00%> (-3.04%)	⬇️
packages/core/util/analytics.ts	89.79% <0.00%> (-2.05%)	⬇️

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