Remove View.Diagnostics from TableViewTest scenario

[Copilot]

Proposed Changes/Todos

• Remove View.Diagnostics = ViewDiagnosticFlags.DrawIndicator; from Examples/UICatalog/Scenarios/TableViewTest.cs

Context

View.Diagnostics is a process-wide static. Setting it in a scenario causes test pollution when parallelized tests execute, leading to non-deterministic failures.

Before:

optionsView = new View ()
{
    // ...
    Title = "Options",
};

View.Diagnostics = ViewDiagnosticFlags.DrawIndicator;  // ← Causes parallel test failures

var offsetLabel = new Label ()

After:

optionsView = new View ()
{
    // ...
    Title = "Options",
};

var offsetLabel = new Label ()

Pull Request checklist:

• I've named my PR in the form of "Fixes #issue. Terse description."
• My code follows the style guidelines of Terminal.Gui
• My code follows the Terminal.Gui library design guidelines
• I ran dotnet test before commit
• I have made corresponding changes to the API documentation (using /// style comments)
• My changes generate no new warnings
• I have checked my code and corrected any poor grammar or misspellings
• I conducted basic QA to assure all features are working

Original prompt

---

This section details on the original issue you should resolve

<issue_title>remove View.Diagnostics set from TableViewTests.cs</issue_title>
<issue_description>Found it. This is the cause of the parallelized unit test failures. View.Diagnostics is a process wide static.

Just delete that line.

Originally posted by @tig in #4731 (comment)
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes remove View.Diagnostics set from TableViewTests.cs #4778

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.53%. Comparing base (bf59dbc) to head (5bc7016).
⚠️ Report is 1 commits behind head on v2_develop.

Additional details and impacted files

@@              Coverage Diff               @@
##           v2_develop    #4781      +/-   ##
==============================================
- Coverage       77.62%   77.53%   -0.09%     
==============================================
  Files             461      461              
  Lines           46088    46088              
  Branches         6835     6835              
==============================================
- Hits            35774    35733      -41     
- Misses           8320     8358      +38     
- Partials         1994     1997       +3     

see 3 files with indirect coverage changes

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