[Temporary KBE] Build Analysis CI mode experiment for #7344

## Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1589488
Build error leg or test failing: Microsoft.ML.Tests.BuildAnalysisTests.CiModeExperiment
Pull request: https://github.com/dotnet/machinelearning/pull/7704
Related issue: https://github.com/dotnet/machinelearning/issues/7344

This is a temporary KBE created solely to validate whether enabling Arcade CI mode prevents a KBE-matched Helix failure from leaving an unmatched generic task exit-code failure. It will be closed after the experiment.

## Error Message

```json
{
"ErrorMessage": "MLNET_BUILD_ANALYSIS_CI_MODE_EXPERIMENT_7344",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

Sample log: https://helix.dot.net/api/jobs/2fcf3f65-9432-446f-a41b-fad123abe427/workitems/Microsoft.ML.Tests/files/console.440b1ec0.log?api-version=2019-06-17

```text
Microsoft.ML.Tests.BuildAnalysisTests.CiModeExperiment [FAIL]
MLNET_BUILD_ANALYSIS_CI_MODE_EXPERIMENT_7344
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589488
**Error message validated:** `[MLNET_BUILD_ANALYSIS_CI_MODE_EXPERIMENT_7344`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 9/10/2026 9:16:28 AM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1590577](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1590577)|dotnet/machinelearning|[Microsoft.ML.Tests.BuildAnalysisTests.CiModeExperiment](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1590577&view=ms.vss-test-web.build-test-results-tab&runId=43906694&resultId=101732)|dotnet/machinelearning#7704|
|[1590576](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1590576)|dotnet/machinelearning|[Microsoft.ML.Tests.BuildAnalysisTests.CiModeExperiment](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1590576&view=ms.vss-test-web.build-test-results-tab&runId=43904892&resultId=101707)|dotnet/machinelearning#7704|
|[1589488](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589488)|dotnet/machinelearning|[Microsoft.ML.Tests.BuildAnalysisTests.CiModeExperiment](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589488&view=ms.vss-test-web.build-test-results-tab&runId=43873156&resultId=101820)|dotnet/machinelearning#7704|
|[1589489](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589489)|dotnet/machinelearning|[Microsoft.ML.Tests.BuildAnalysisTests.CiModeExperiment](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589489&view=ms.vss-test-web.build-test-results-tab&runId=43874328&resultId=101624)|dotnet/machinelearning#7704|
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|0|4|4|

Start with the Microsoft.ML.Tests.BuildAnalysisTests.CiModeExperiment test and review the linked build logs and related issue #7344. Confirm the Arcade CI mode experiment's result against the reported Helix failure, then verify the known-issue validation outcome; this temporary issue is done when the experiment is validated and can be closed.

Written by the indexing model from the issue text.