fix: DH-21616: use model text color instead of databar color for cell text

[gzh2003]

For DH-21616. Previously, DataBarCellRenderer used the databar fill color for both the bar and the text, ignoring any explicit text color set via TableFormat.color.

Now calls model.colorForCell() to check for an explicit text color. If one is set, it takes precedence over the databar color for text rendering. When no explicit text color is set, the text still inherits the databar color.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.77%. Comparing base (0cab21d) to head (ee911da).
⚠️ Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/grid/src/DataBarCellRenderer.ts	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2629      +/-   ##
==========================================
+ Coverage   49.48%   49.77%   +0.28%     
==========================================
  Files         772      774       +2     
  Lines       43738    43777      +39     
  Branches    11066    11262     +196     
==========================================
+ Hits        21643    21788     +145     
+ Misses      22077    21971     -106     
  Partials       18       18              

Flag	Coverage Δ
unit	49.77% <0.00%> (+0.28%)	⬆️

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[dsmmcken]

This was a stylistic choice. However, I agree that explicitly setting a color should override it.

Does this code still maintain that choice, if I make a purple, or gradient bar with no explicit text color set, is the color still the same as it was?

[mofojed]

This isn't really correct, as we may return a green/red colour for positive/negative numbers.
Instead, we should be looking if a colour is set explicitly in the Format. E.g.

const format = model.formatForCell(...);
if (format?.color != null && format?.color != '') {
  ...
} else if (hasGradient) {