DH-11788: Enable count aggregations for non-rollups

[dsmmcken]

Count now works as an aggregation for non-rollups. There are no longer any that are rollup exclusively. Leaving code to allow it in future in case any new rollup only aggregation method gets added.

[codecov]

Codecov Report

Merging #331 (9fa52ab) into main (1a9f7fb) will decrease coverage by 14.36%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main     #331       +/-   ##
===========================================
- Coverage   39.67%   25.30%   -14.37%     
===========================================
  Files         328        2      -326     
  Lines       23250      735    -22515     
  Branches     4790      329     -4461     
===========================================
- Hits         9224      186     -9038     
+ Misses      13573      468    -13105     
+ Partials      453       81      -372     

Flag	Coverage Δ
unit	25.30% <0.00%> (-14.37%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/iris-grid/src/TableUtils.js	24.25% <0.00%> (-42.23%)	⬇️
...-grid/src/sidebar/aggregations/AggregationUtils.ts	47.05% <ø> (-6.79%)	⬇️
packages/chart/src/ChartUtils.js
packages/code-studio/src/log/LogExport.ts
packages/components/src/AutoResizeTextarea.tsx
packages/grid/src/GridMetricCalculator.ts
packages/grid/src/GridRange.ts
packages/grid/src/GridRenderer.js
... and 319 more

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