Add get_project MCP tool

Giannis Kepasrequested to merge
gitlab-community/gitlab-org/gitlab:605858-mcp-get-project into master

What does this MR do and why?

Adds get_project MCP tool for agents while following the implementation guidelines and plan described in the related issue.

Related to #605858 (closed)

Edited by Giannis Kepas

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