Draft: Workhorse: Implement MCP client

Igor Drozdovrequested to merge
id-workhorse-mcp-client into master

What does this MR do and why?

This MR implements MCP client in Workhorse. The primary goal is to dogfood the official Gitlab MCP server. A potential benefit is to allow specifying MCP servers in Gitlab UI and perform requests to them from Workhorse.

Relates to #561296 (closed)

Edited by Martin Wortschack

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