System.Formats.Nrbf.Tests timeout occasionally in the CI

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1353436
Build error leg or test failing: System.Formats.Nrbf.Tests.WorkItemExecution
Pull request: https://github.com/dotnet/runtime/pull/126043

## Error Message

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Projects/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorMessage": "'System.Formats.Nrbf.Tests' END OF WORK ITEM LOG: Command timed out, and was killed",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1353436
**Error message validated:** `['System.Formats.Nrbf.Tests' END OF WORK ITEM LOG: Command timed out, and was killed`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 3/31/2026 2:38:07 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1577668](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577668)|dotnet/runtime|[System.Formats.Nrbf.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577668&view=ms.vss-test-web.build-test-results-tab&runId=43498368&resultId=240427)||
|[1572029](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1572029)|dotnet/runtime|[System.Formats.Nrbf.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1572029&view=ms.vss-test-web.build-test-results-tab&runId=43299064&resultId=240507)||
|[1558022](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1558022)|dotnet/runtime|[System.Formats.Nrbf.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1558022&view=ms.vss-test-web.build-test-results-tab&runId=42880384&resultId=239486)||
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|0|0|3|