[torchci] Fix missing background on "AI: related" HUD grid badge (#8175)

## Summary

On the HUD commit×job grid, the small `ai` advisor badge overlaid on the
failure icon renders with **no background** for the `related` verdict
(it shows as bare text instead of the red pill the other verdicts get).

## Root cause

The grid badge builds its CSS class **dynamically** in
`[[...page]].tsx`:

```tsx
className={`${styles.advisorBadge} ${
  styles[`advisorVerdict_${advisorVerdict.verdict}` as keyof typeof styles] ?? ""
}`}
```

`hud.module.css` defines `.advisorVerdict_revert`, `_not_related`,
`_garbage`, and `_unsure` — but the recent **revert → related** verdict
migration renamed the verdict without adding a matching
`.advisorVerdict_related` class. So `related` verdicts fall through the
`?? ""` fallback and get no background.

The other three render paths (`AutorevertCell.tsx`,
`AdvisorSection.tsx`, `AiAdvisorIndicator.tsx`) were all updated for the
migration to treat `related == revert`; only this CSS map was missed.

## Fix

Add `.advisorVerdict_related` sharing the same red styling as
`.advisorVerdict_revert`. `revert` is kept for any legacy/in-flight
verdicts still using the old value.

```css
.advisorVerdict_revert,
.advisorVerdict_related {
  background: #d32f2f;
  color: #fff;
}
```

## Test plan

- CSS-only change; `yarn prettier --check components/hud.module.css`
passes.
- Verified the dynamic class `advisorVerdict_related` now resolves to a
defined rule, matching how
`AutorevertCell`/`AdvisorSection`/`AiAdvisorIndicator` already map
`related → revert` (red).

Co-authored-by: Ivan <izaitsevfb@meta.com>

Author: izaitsevfb

torchci/components/hud.module.css

@@ -243,7 +243,8 @@
   pointer-events: none;
 }
 
-.advisorVerdict_revert {
+.advisorVerdict_revert,
+.advisorVerdict_related {
   background: #d32f2f;
   color: #fff;
 }