HParams: project color header #6434
Merged
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Motivation for features / changes
In #6422 we started projecting the header components into the data table widget. However, the content was still not projected and the color column was hard coded in. Therefore we left a hard coded color header. The content started being projected in #6427. Therefore we can stop hardcoding this color column. This PR removes the hardcoded header column and starts adding it from the ScalarCardDataTable
Technical description of changes
The color header cannot be sorted, dismissed, or dragged. There was some logic in place for this. However, it was incomplete. This completes that logic and uses it for the color header. We also add tests for that logic which were not in place before.
Note: I did some test clean up in the HeaderCell
Screenshot of changes
It still works.

ComponentTests for consistency.