[Agentic Chat] Support multiple projects included through `/include repository`
## Context As part of supporting "Chat with your codebase" in Agentic Chat, we are introducing the Codebase Search Tool into it (https://gitlab.com/gitlab-org/gitlab/-/issues/569624). This search tool must be able to support codebase search on: 1. A single project - https://gitlab.com/gitlab-org/gitlab/-/issues/569624 - :white_check_mark: - The active project in the user's workspace - A single project included through `/include repository` - A single project specified in the user's question 2. **Multiple projects - THIS ISSUE** - **Multiple projects specified in the user's question - [no changes needed](https://gitlab.com/gitlab-org/gitlab/-/issues/569625#note_2880055907)** - **Multiple projects selected through `/include repository`** ## References Epic: https://gitlab.com/groups/gitlab-org/-/epics/18193 ## Proposal TBA
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