Fix colors in multiple series charts
requested to merge 202620-charts-with-series-that-contain-multiple-labels-do-not-have-unique-colors-for-each-label into master
What does this MR do?
Removes color assignment of the lineStyle options object in order to default to the colors defined by gitlab-ui.
The previous assignment of colors was being done with one color per entire metric, so all series in a metric had the same color.
Related issues: #202620 (closed), #208486 (closed)
Screenshots
Before
After
Does this MR meet the acceptance criteria?
Conformity
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