fix: CRD column generation for non-nullable Types

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 29.22%. Comparing base (277d669) to head (290eebe). Report is 1 commits behind head on alpha.

Files with missing lines	Patch %	Lines
src/KubeUI/ViewModels/ResourceListViewModel.cs	0.00%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## alpha #780 +/- ## ========================================== - Coverage 29.23% 29.22% -0.01% ========================================== Files 77 77 Lines 6924 6926 +2 Branches 1147 1148 +1 ========================================== Hits 2024 2024 - Misses 4842 4844 +2 Partials 58 58 ```

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[github-actions[bot]]

:tada: This PR is included in version 1.0.0-alpha.81 :tada:

The release is available on GitHub release

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