Integration tests fail to wait for async light bulb

[sharwell]

https://dev.azure.com/dnceng/public/_build/results?buildId=1433408

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Exception: The following expected item(s) not found:
Add reference to 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
Actual items:

   at Microsoft.VisualStudio.IntegrationTest.Utilities.TestUtilities.ThrowIfExpectedItemNotFound[TCollection](IEnumerable`1 actual, IEnumerable`1 expected) in /_/src/VisualStudio/IntegrationTest/TestUtilities/TestUtilities.cs:line 46
   at Microsoft.VisualStudio.IntegrationTest.Utilities.OutOfProcess.TextViewWindow_OutOfProc.Verifier`1.CodeActions(IEnumerable`1 expectedItems, String applyFix, Boolean verifyNotShowing, Boolean ensureExpectedItemsAreOrdered, Nullable`1 fixAllScope, Boolean blockUntilComplete) in /_/src/VisualStudio/IntegrationTest/TestUtilities/OutOfProcess/TextViewWindow_OutOfProc.Verifier.cs:line 87
   at Microsoft.VisualStudio.IntegrationTest.Utilities.OutOfProcess.TextViewWindow_OutOfProc.Verifier`1.CodeAction(String expectedItem, Boolean applyFix, Boolean verifyNotShowing, Boolean ensureExpectedItemsAreOrdered, Nullable`1 fixAllScope, Boolean blockUntilComplete) in /_/src/VisualStudio/IntegrationTest/TestUtilities/OutOfProcess/TextViewWindow_OutOfProc.Verifier.cs:line 46
   at Roslyn.VisualStudio.IntegrationTests.CSharp.CSharpAddMissingReference.InvokeSomeFixesInCSharpThenVerifyReferences() in /_/src/VisualStudio/IntegrationTest/IntegrationTests/CSharp/CSharpAddMissingReference.cs:line 170
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Xunit.Sdk.TestInvoker`1.CallTestMethod(Object testClassInstance) in C:\projects\xunit\src\xunit.execution\Sdk\Frameworks\Runners\TestInvoker.cs:line 150
   at Xunit.Sdk.TestInvoker`1.<>c__DisplayClass48_1.<<InvokeTestMethodAsync>b__1>d.MoveNext() in C:\projects\xunit\src\xunit.execution\Sdk\Frameworks\Runners\TestInvoker.cs:line 257
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Xunit.Sdk.ExecutionTimer.<AggregateAsync>d__4.MoveNext() in C:\projects\xunit\src\xunit.execution\Sdk\Frameworks\ExecutionTimer.cs:line 48
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

Build	Kind	Start Time
1425774	Rolling	2021-17-10
1427791	Rolling	2021-18-10
1427988	Rolling	2021-18-10
1428386	Rolling	2021-18-10
1429399	Rolling	2021-19-10
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1433408	Rolling	2021-20-10
1433571	Rolling	2021-21-10
1434178	PR 57029	2021-21-10
1434238	PR 56197	2021-21-10
1434504	PR 57084	2021-21-10
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1435049	PR 57310	2021-21-10
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1435242	PR 57312	2021-21-10
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1435255	PR 57310	2021-21-10
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1435603	PR 57317	2021-22-10
1435875	PR 56008	2021-22-10
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1436044	PR 56008	2021-22-10
1436306	PR 54559	2021-22-10
1436469	Rolling	2021-22-10
1436461	PR 57318	2021-22-10
1436565	PR 57266	2021-22-10
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1440029	Rolling	2021-25-10
1440265	Rolling	2021-26-10
1440695	PR 57029	2021-26-10
1440894	Rolling	2021-26-10