Moved local methods to private for future reuse

[Tanya-Solyanik]

Microsoft Reviewers: Open in CodeFlow

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 91.11111% with 8 lines in your changes missing coverage. Please review.

Project coverage is 74.37268%. Comparing base (08a230f) to head (01f53aa). Report is 1 commits behind head on feature/clipboard.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature/clipboard #11481 +/- ## =========================================================== - Coverage 74.37746% 74.37268% -0.00478% =========================================================== Files 3028 3028 Lines 627670 627670 Branches 46764 46764 =========================================================== - Hits 466845 466815 -30 - Misses 157468 157494 +26 - Partials 3357 3361 +4 ``` | [Flag](https://app.codecov.io/gh/dotnet/winforms/pull/11481/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/11481/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `74.37268% <91.11111%> (-0.00478%)` | :arrow_down: | | [integration](https://app.codecov.io/gh/dotnet/winforms/pull/11481/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `17.98160% <18.88889%> (-0.00880%)` | :arrow_down: | | [production](https://app.codecov.io/gh/dotnet/winforms/pull/11481/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `47.17008% <91.11111%> (-0.01052%)` | :arrow_down: | | [test](https://app.codecov.io/gh/dotnet/winforms/pull/11481/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `96.98803% <ø> (ø)` | | | [unit](https://app.codecov.io/gh/dotnet/winforms/pull/11481/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `44.15502% <91.11111%> (-0.01264%)` | :arrow_down: | 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.