feat(experiments): Add primary and secondary metric explanation

[danielbachhuber]

Changes

Adds an explanation of primary and secondary metrics to the new experiment UI

Before

After

How did you test this code?

Visual review

[greptile-apps]

PR Summary

This PR enhances the MetricsView component by adding clear explanations about primary and secondary metrics in experiments, improving user understanding.

• Added informative tooltips in /frontend/src/scenes/experiments/MetricsView/MetricsView.tsx explaining primary metrics as main experiment goals and secondary metrics as additional context
• Added empty state explanations for both metric types with improved text formatting and max-width constraints
• Implemented hover tooltips that appear when metrics are present to provide ongoing context
• Enhanced visual layout with proper spacing and text balance for better readability

_{1 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings | Greptile}

[github-actions]

Size Change: +5 B (0%)

Total Size: 1.16 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.16 MB	+5 B (0%)

_{compressed-size-action}