supabase / supabase / 27275478727

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fix(reports): show absolute CPU usage instead of normalized stack DEBUG-135 (#46781)

## Problem
The CPU usage chart rendered every bar as nearly full (looked like ~100%
CPU) even when actual usage was 0.13%. The header value and tooltip were
correct (0.13%); only the bars were wrong.

## Cause
The chart used `normalizeVisibleStackToPercent: true`, which rescales
the visible stacked series so they always sum to 100% of the bar height.
The CPU series are already absolute percentages, so normalizing
stretched a real 0.13% to fill the whole bar. The `Idle` series existed
only to pad the stack to 100%.

## Fix
- Remove `normalizeVisibleStackToPercent` from the CPU chart so series
render at absolute values against the fixed 0-100% Y axis.
- Drop the `Idle` series (no longer needed to pad the stack, and we
don't want to show it).
- Revert the unused `hideFromLegend` plumbing from the earlier attempt.

Result: low CPU usage now renders as a near-empty bar, accurately
reflecting the real value.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Updated CPU usage chart in database reports to display a focused set
of CPU metrics.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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