Add disconnect button next to edit button in Object Explorer connection panel

[Copilot]

This PR adds a disconnect button inline next to the edit button for connection nodes in the Object Explorer panel, matching the behavior available in Azure Data Studio.

Problem

Currently in VS Code MSSQL extension, connected servers only show an edit button inline in the Object Explorer. Users have to right-click to access the disconnect option, which is less convenient than the Azure Data Studio experience where both edit and disconnect buttons are visible inline.

Before (VS Code):

• Only edit button (pencil icon) visible inline
• Disconnect only available via right-click context menu

After (matches Azure Data Studio):

• Edit button (pencil icon) appears first
• Disconnect button (debug-disconnect icon) appears second inline
• Both buttons easily accessible without right-clicking

Implementation

The changes leverage existing functionality and commands:

1. Added inline menu configuration for mssql.disconnectObjectExplorerNode command
2. Enhanced command definition with $(debug-disconnect) icon for proper inline display
3. Set appropriate group priorities to ensure correct button ordering

The disconnect functionality already existed and was fully implemented - this change simply makes it more accessible by adding it to the inline action buttons alongside the existing edit button.

Technical Details

• Uses existing mssql.disconnectObjectExplorerNode command (no new functionality required)
• Follows established patterns for inline menu items in the codebase
• Maintains all existing context menu functionality
• Only appears for connected servers (type=Server viewItem context)

Fixes #19781.

Warning

Firewall rules blocked me from connecting to one or more addresses

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

• update.code.visualstudio.com
  • Triggering command: node ./out/test/unit/runTest.js (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)

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