fix: Conditional formatting not being applied to custom columns

[emilyhuxng]

Fixes #1135

Removed getCachedModelColumns and uses model.columns instead.

[codecov]

Codecov Report

Merging #1181 (8cff155) into main (778346c) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1181      +/-   ##
==========================================
- Coverage   44.16%   44.16%   -0.01%     
==========================================
  Files         447      447              
  Lines       33275    33273       -2     
  Branches     8357     8357              
==========================================
- Hits        14696    14694       -2     
  Misses      18530    18530              
  Partials       49       49              

Flag	Coverage Δ
unit	44.16% <ø> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
packages/iris-grid/src/IrisGrid.tsx	26.96% <ø> (-0.10%)	⬇️

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[mofojed]

Just adding a note to my previous comment from @vbabich 's change for Conditional Formatting: https://github.com/deephaven/web-client-ui/pull/409/files#r812346032
It appears this render loop is no longer the case - I tried adding/removing custom columns and conditional formatting, and didn't get stuck in a render loop (kept Profiler open to see when redraws occurred).
I think this issue was resolved with the changes for #986 or #1013.