Implement missing `RemoveToolTip` on `UpDownBase` to cleanup `ToolTip`

[elachlan]

Makes sure that the _upDownEdit and _upDownButtons have their tooltip removed.

Fixes #11417

I am unsure how to add tests for this. I manually tested the fix.

[elachlan]

@Olina-Zhang can your team please test this fix?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 74.29002%. Comparing base (0aa3a4d) to head (d2a1031). Report is 20 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #11419 +/- ## =================================================== + Coverage 74.26256% 74.29002% +0.02746% =================================================== Files 3025 3026 +1 Lines 626861 627165 +304 Branches 46742 46759 +17 =================================================== + Hits 465523 465921 +398 + Misses 157993 157897 -96 - Partials 3345 3347 +2 ``` | [Flag](https://app.codecov.io/gh/dotnet/winforms/pull/11419/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | Coverage Δ | | |---|---|---| | [Debug](https://app.codecov.io/gh/dotnet/winforms/pull/11419/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `74.29002% <83.33333%> (+0.02746%)` | :arrow_up: | | [integration](https://app.codecov.io/gh/dotnet/winforms/pull/11419/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `17.99948% <0.00000%> (+0.00354%)` | :arrow_up: | | [production](https://app.codecov.io/gh/dotnet/winforms/pull/11419/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `47.02193% <62.50000%> (+0.03602%)` | :arrow_up: | | [test](https://app.codecov.io/gh/dotnet/winforms/pull/11419/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `96.98772% <100.00000%> (+0.00087%)` | :arrow_up: | | [unit](https://app.codecov.io/gh/dotnet/winforms/pull/11419/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `43.99770% <62.50000%> (+0.03152%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet#carryforward-flags-in-the-pull-request-comment) to find out more.

[Olina-Zhang]

@Olina-Zhang can your team please test this fix?

Tested this PR based on the latest .NET 9.0 SDK build for GH Issue: https://github.com/dotnet/winforms/issues/11417, it is fixed with no new issue found.

[elachlan]

Thank you @Olina-Zhang!!

[lonitra]

Looks like we have a test that checks what we set the tooltip for UpDownBase if what is expected. https://github.com/dotnet/winforms/blob/f53f153808bbbaddda3f0c1e994e8a3b5cc085a9/src/System.Windows.Forms/tests/UnitTests/System/Windows/Forms/UpDownBaseTests.cs#L3015-L3035

We can use this as a base to write another test checking if setting to empty works as expected. Could you test if setting the tooltip for UpDownBase multiple times works as expected as well?

[elachlan]

Thanks I'll write one up and test asap.

[elachlan]

@lonitra I added the code to the existing test, since we would have to have the whole test replicated again anyway to set the initial tooltip text.