Remove default editor.formatOnType configuration for C#

[Copilot]

Summary

Originally we enabled format on type to ensure brace formatting on enter worked correctly. However

1. We've had a number of complaints about format on type being enabled by default
2. The format on type implementation has at least 1 known issue that is difficult to resolve - C# Automatic indentation formatting appears to be broken #8692 due to the formatting on type engine not being designed to handle non virtual space.
3. We have moved brace formatting on enter to a separate custom call (on auto insert).

Because of these, we think the best path forward for the moment is to remove the default contribution to enable format on type.

Changes

• Removed the [csharp] configuration block from the configurationDefaults section in package.json
• This disables on-type formatting by default for C# files

Impact

Before: On-type formatting was automatically enabled for all C# files, causing issues for users when typing semicolons, braces, and other trigger characters.

After: On-type formatting is disabled by default. Users who want this functionality can still enable it manually in their VS Code settings:

{
  "[csharp]": {
    "editor.formatOnType": true
  }
}

Technical Details

• The on-type formatting functionality itself remains unchanged - this PR only removes the default configuration
• Integration tests for on-type formatting continue to work as expected (they test the feature directly via VS Code commands)
• The change is minimal and surgical - only 3 lines removed from package.json

This allows users to opt-in to on-type formatting if they want it, rather than dealing with the known issues by default.

Original prompt

Can you remove the configuration that enables on type formatting by default from the package.json? The on type formatter has issues we cannot immediately fix

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