Fix auto-insert ignoring language-specific editor.tabSize

[Copilot]

Auto-insert was using global editor.tabSize instead of respecting C#-specific overrides like "[csharp]": { "editor.tabSize": 4 }.

Changes

• onAutoInsert.ts: Pass document URI to getConfiguration() to enable language-specific setting resolution

  // Before
  const editorConfig = vscode.workspace.getConfiguration('editor');
  
  // After  
  const editorConfig = vscode.workspace.getConfiguration('editor', resource);

• onAutoInsert.integration.test.ts: Add test verifying language-specific tabSize is respected

Fixes #8755

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• update.code.visualstudio.com
  • Triggering command: gulp test:integration:csharp (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Fix #8755
Likely the code here needs to be updated - https://github.com/dotnet/vscode-csharp/blob/main/src/lsptoolshost/autoInsert/onAutoInsert.ts#L145

Additionally, ideally the options would respect not just the language setting value, but also the detected space setting if it is different from the general one. Potentially the actual file being edited needs to be passed in as the resource?

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