Bug 2057561 - Optimize array mapping and siblings rerenders (Fix 3)

[davidmiculit]

Bug 2057561 - Improve frontend performance on Graphs View

Toggling the visibility of a single series unnecessarily maps over the entire testData array and triggers expensive re-renders for all sibling LegendCard components.

Fix:

• Wrap LegendCard in React.memo with a custom comparator on series.signature_id + series.visible.
• Refactor the updateSelectedTest visibility-toggle handler to bypass the full-array .map(). It now performs an O(1) immutable single-item update by finding the target index, cloning the specific item, and rebuilding the array using slice.

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