[CI] Build broken on main — 20260620.3

> :robot: This issue was filed automatically by a daily monitoring bot.

The most recent completed run of the internal `microsoft-aspire` pipeline on `main` failed.

- **Build:** 20260620.3 (id: 3004868)
- **Result:** Failed
- **Started:** 2026-06-21T03:08:55Z · **Finished:** 2026-06-21T04:34:33Z
- **Commit:** `b41679901b627c631b90ca44f0b04a4fc33c3809`
- **Internal link:** https://dev.azure.com/dnceng/internal/_build/results?buildId=3004868

### First-level analysis

The **SourceIndexStage1** job timed out — it exceeded the 60-minute job timeout limit. All other jobs completed with only warnings (SDL/compliance noise). Root cause is likely infrastructure slowness or a hang in the source-indexing step.

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cc @radical @joperezr