Implements graphql mcp create work item note mutation

What does this MR do and why?

AI Summary:

This MR implements a GraphQL-based MCP (Model Context Protocol) mutation for creating notes (comments) on work items. The implementation provides a flexible API that supports both project and group work items, with multiple identification methods.

Key features:

• Flexible work item identification: Supports identification via URL, project_id/group_id with work_item_iid, or direct GitLab URLs
• Note creation capabilities: Creates notes with optional parameters including internal flag and discussion threading
• Quick action validation: Prevents quick actions (commands starting with /) in note bodies to maintain API consistency
• Comprehensive access control: Validates user permissions for both parent resources (projects/groups) and work items
• Full test coverage: Includes extensive unit and integration tests for all components

Architecture:

The implementation follows a modular design with reusable concerns:

• Constants - Defines work item types and URL patterns
• ResourceFinder - Handles resource lookup and access control
• UrlParser - Parses and resolves GitLab URLs
• BaseTool - Provides shared functionality for work item tools
• CreateWorkItemNoteTool - Implements the GraphQL mutation
• GraphqlCreateWorkItemNoteService - Service layer for the MCP tool

Supported parameters:

• Work item identification: url, project_id/group_id + work_item_iid
• Note content: body (required, max 1,048,576 characters)
• Optional: internal (boolean), discussion_id (for threading replies)

References

• Issue: #581890 (closed)
• Existing DAP tool implementation
• Base implementation: Implement GraphQL MCP integration (!211553 - merged)

Screenshots or screen recordings

Before	After

How to set up and validate locally

You can test create_workitem_note tool using MCP inspector.

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