Uninstalls duplicate MCP

[sergeibbb]

Description

Fixes #4626

Checklist

• I have followed the guidelines in the Contributing document
• My changes follow the coding style of this project
• My changes build without any errors or warnings
• My changes have been formatted and linted
• My changes include any required corresponding changes to the documentation (including CHANGELOG.md and README.md)
• My changes have been rebased and squashed to the minimal number (typically 1) of relevant commits
• My changes have a descriptive commit message with a short title, including a Fixes $XXX - or Closes #XXX - prefix to auto-close the issue that your PR addresses

[Copilot]

Pull Request Overview

This PR fixes issue #4626 by preventing duplicate MCP (Model Context Protocol) configurations. When the GitKraken MCP is registered, it now automatically uninstalls any existing external MCP configuration with the same app name to avoid duplication.

Key changes:

• Modified onRegistrationCompleted to accept additional parameters and call a new uninstall method
• Added uninstallExternalMcp method to remove duplicate external MCP configurations
• Updated CHANGELOG.md to document the fix

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/env/node/gk/mcp/integration.ts	Added logic to uninstall external MCP configurations after successful registration to prevent duplicates
CHANGELOG.md	Added entry documenting the fix for MCP duplication issue #4626

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[Copilot]

The uninstall operation happens after registration completes, which could lead to a race condition if another process is using the external MCP. Consider uninstalling the external MCP before registration instead of after, to prevent potential conflicts.