Uninstalls duplicate MCP

[sergeibbb]

Description

Fixes #4626

Checklist

• I have followed the guidelines in the Contributing document
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[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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[sergeibbb]

@eamodio I have one doubt here.

I suppose, the result of the fix should give us the following:

• User comes to us and says "I have duplication of MCP"
• We say: "Try one of the following" (both work):

1. Reload your IDE window
2. Call GitLens: Reinstall GitKraken MCP in the command palette.

However, now we might have problem with the option #2.

That's because, I call deduping after the successful config call, here:

But it's never called twice until the version of the GK CLI is updated:

Therefore, the question is the following:

1. Is it OK that the second recipe won't always work (only once per launch)
2. Or is it better to move deduping command to another place? e.g. from onRegistrationCompleted to getMcpConfigurationFromCLI ?

cc @axosoft-ramint