Unstable unit test: System.Windows.Forms.Tests.ToolTipTests.ToolTip_SetToolTip_TabControl_DoesNotAddToolForTabControlItself

Related #11227

### Test

System.Windows.Forms.Tests.ToolTipTests.ToolTip_SetToolTip_TabControl_DoesNotAddToolForTabControlItself

### Issue description

**The case failed in X64 unit tests, the failure link:**

- [#20240413.23 • Enable nullability in DocumentInheritanceService](https://dev.azure.com/dnceng-public/public/_build/results?buildId=642628&view=ms.vss-test-web.build-test-results-tab&runId=15848884&resultId=114430)
- [#20240411.4 • [main] Update dependencies from dotnet/arcade (#11200)](https://dev.azure.com/dnceng-public/public/_build/results?buildId=639450&view=ms.vss-test-web.build-test-results-tab&runId=15759194&resultId=116746)

**Error Message:**

- **In X64 unit:**
- Assert.Equal() Failure: Values differ
Expected: 2
Actual: 0

**Stack trace:**
```
at System.Windows.Forms.Tests.ToolTipTests.ToolTip_SetToolTip_TabControl_DoesNotAddToolForTabControlItself() in D:\a\_work\1\s\src\System.Windows.Forms\tests\UnitTests\System\Windows\Forms\ToolTipTests.cs:line 887
at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
```