AutoML tests writing test output outside of a test which causes test process to fail with no failing test cases

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=601237
Build error leg or test failing: Microsoft.ML.AutoML.Tests.WorkItemExecution
Pull request: https://github.com/dotnet/machinelearning/pull/7064

## Error Message

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Projects/Build%20Analysis/KnownIssues.md#how-to-fill-out-a-known-issue-error-section).

```json
{
"ErrorMessage": ["System.InvalidOperationException: There is no currently active test.", "at Microsoft.ML.AutoML.CancellationTokenStopTrainingManager"],
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

Sample log: https://helixre107v0xdeko0k025g8.blob.core.windows.net/dotnet-machinelearning-refs-pull-7064-merge-fb45c2e048d6480197/Microsoft.ML.AutoML.Tests/1/console.02bc281b.log?helixlogtype=result
```
Unhandled exception: System.AggregateException: One or more errors occurred. ---> System.InvalidOperationException: There is no currently active test.
at Xunit.Sdk.TestOutputHelper.GuardInitialized() in /_/src/xunit.execution/Sdk/Frameworks/TestOutputHelper.cs:line 52
at Xunit.Sdk.TestOutputHelper.QueueTestOutput(String output) in /_/src/xunit.execution/Sdk/Frameworks/TestOutputHelper.cs:line 63
at Microsoft.ML.AutoML.Test.AutoMLExperimentTests.b__5_0(Object o, LoggingEventArgs e) in D:\a\_work\1\s\test\Microsoft.ML.AutoML.Tests\AutoMLExperimentTests.cs:line 159
at Microsoft.ML.MLContext.ProcessMessage(IMessageSource source, ChannelMessage message) in D:\a\_work\1\s\src\Microsoft.ML.Data\MLContext.cs:line 162
at Microsoft.ML.Runtime.HostEnvironmentBase`1.Dispatcher`1.DispatchCore(IMessageSource sender, TMessage message) in D:\a\_work\1\s\src\Microsoft.ML.Core\Environment\HostEnvironmentBase.cs:line 313
at Microsoft.ML.Runtime.HostEnvironmentBase`1.ChannelBase.Info(MessageSensitivity sensitivity, String msg) in D:\a\_work\1\s\src\Microsoft.ML.Core\Environment\HostEnvironmentBase.cs:line 256
at Microsoft.ML.Runtime.HostExtensions.Info(IChannel ch, String fmt) in D:\a\_work\1\s\src\Microsoft.ML.Core\Data\IHostEnvironment.cs:line 314
at Microsoft.ML.AutoML.CancellationTokenStopTrainingManager.<.ctor>b__5_0() in D:\a\_work\1\s\src\Microsoft.ML.AutoML\AutoMLExperiment\IStopTrainingManager.cs:line 36
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.CancellationCallbackInfo.ExecuteCallback()
at System.Threading.CancellationTokenSource.ExecuteCallbackHandlers(Boolean throwOnFirstException)
--- End of inner exception stack trace ---
at System.Threading.CancellationTokenSource.ExecuteCallbackHandlers(Boolean throwOnFirstException)
at System.Threading.CancellationTokenSource.NotifyCancellation(Boolean throwOnFirstException)
at System.Threading.CancellationTokenSource.TimerCallbackLogic(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.TimerQueueTimer.CallCallback()
at System.Threading.TimerQueueTimer.Fire()
at System.Threading.TimerQueue.FireNextTimers()
---> (Inner Exception #0) System.InvalidOperationException: There is no currently active test.
at Xunit.Sdk.TestOutputHelper.GuardInitialized() in /_/src/xunit.execution/Sdk/Frameworks/TestOutputHelper.cs:line 52
at Xunit.Sdk.TestOutputHelper.QueueTestOutput(String output) in /_/src/xunit.execution/Sdk/Frameworks/TestOutputHelper.cs:line 63
at Microsoft.ML.AutoML.Test.AutoMLExperimentTests.b__5_0(Object o, LoggingEventArgs e) in D:\a\_work\1\s\test\Microsoft.ML.AutoML.Tests\AutoMLExperimentTests.cs:line 159
at Microsoft.ML.MLContext.ProcessMessage(IMessageSource source, ChannelMessage message) in D:\a\_work\1\s\src\Microsoft.ML.Data\MLContext.cs:line 162
at Microsoft.ML.Runtime.HostEnvironmentBase`1.Dispatcher`1.DispatchCore(IMessageSource sender, TMessage message) in D:\a\_work\1\s\src\Microsoft.ML.Core\Environment\HostEnvironmentBase.cs:line 313
at Microsoft.ML.Runtime.HostEnvironmentBase`1.ChannelBase.Info(MessageSensitivity sensitivity, String msg) in D:\a\_work\1\s\src\Microsoft.ML.Core\Environment\HostEnvironmentBase.cs:line 256
at Microsoft.ML.Runtime.HostExtensions.Info(IChannel ch, String fmt) in D:\a\_work\1\s\src\Microsoft.ML.Core\Data\IHostEnvironment.cs:line 314
at Microsoft.ML.AutoML.CancellationTokenStopTrainingManager.<.ctor>b__5_0() in D:\a\_work\1\s\src\Microsoft.ML.AutoML\AutoMLExperiment\IStopTrainingManager.cs:line 36
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.CancellationCallbackInfo.ExecuteCallback()
at System.Threading.CancellationTokenSource.ExecuteCallbackHandlers(Boolean throwOnFirstException)<---
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=601237
**Error message validated:** `[System.InvalidOperationException: There is no currently active test. at Microsoft.ML.AutoML.CancellationTokenStopTrainingManager`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 3/13/2024 7:06:40 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1584925](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584925)|dotnet/machinelearning|[Microsoft.ML.AutoML.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584925&view=ms.vss-test-web.build-test-results-tab&runId=43731580&resultId=101952)||
|[1584628](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584628)|dotnet/machinelearning|[Microsoft.ML.AutoML.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1584628&view=ms.vss-test-web.build-test-results-tab&runId=43723224&resultId=101955)|dotnet/machinelearning#7692|
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|0|0|2|