[RHOAIENG-7794]: Use different colors for the ROC curve legend

[jenny-s51]

https://issues.redhat.com/browse/RHOAIENG-7794

Description

Previously in pipelines compare runs we would compare many ROC curves in one graph by using different shades of blue, but per the PF recommendation we should instead be corresponding each run with one of the available base colors.

Before

After

How Has This Been Tested?

Compare runs that have all metrics. Use the following pipeline
Pipeline metrics-visualization-pipeline.yaml.zip

Test Impact

N/A, color change only

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Commits have been squashed into descriptive, self-contained units of work (e.g. 'WIP' and 'Implements feedback' style messages have been removed)
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change (find relevant UX in the SMEs section).

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[Gkrumbach07]

/lgtm

[Gkrumbach07]

waiting on 1 more review @jenny-s51

[Gkrumbach07]

/approve

[openshift-ci]

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