feat: add xray data to /refactor, /fix, and /tests prompts

What does this merge request do and why?

For gitlab-org/gitlab#450753 (closed)

• gitlab-org/gitlab!173750 (merged) solves the monolith part
• This MR solves the aigw part

The Repository X-Ray is a tool that searches for dependency manager configuration/lock files and then extracts a list of libraries from the content.

gitlab-org/gitlab!173750 (merged) fetches the latest xray report (if available) for a project and includes this xray_data in the prompt_options that are passed to the aigw for /refactor, /fix, and /tests. This MR then adds the xray_data to the corresponding prompts in the aigw. Given this context the code refactored/fixed/with tests should be more relevant and higher quality.

How to set up and validate locally

1. Set up LangSmith tracing for Duo Chat: https://docs.gitlab.com/ee/development/ai_features/duo_chat.html#use-tracing-with-langsmith
2. Follow the validation steps in this related MR to trigger creating an xray report for a project in gdk. Make a note of the project id where the xray report was generated: gitlab-org/gitlab!165391 (merged)
3. Run gdk locally but gdk stop gitlab-ai-gateway, we're going to run this separately
4. Open a second terminal and cd gitlab-ai-gateway then poetry shell and poetry run ai_gateway
5. Go to the graphql explorer: http://gdk.test:3000/-/graphql-explorer
6. Run a mutation to trigger /refactor, /fix, or /tests, be sure to pass in the correct id for the project where you created an xray report

   mutation {
     aiAction(
       input: {
         chat: {
           content: "/refactor", 
           currentFile: {
             selectedText: "\n@sold_items = %w( onions garlic potatoes ) \ndef print_report\nputs '*** Sales Report for #{Time.new.strftime('%d/%m/%Y')} ***'\n@sold_items.each { |i| puts i }\nputs '*** End of Sales Report ***'\nend",
             fileName: "hello.rb"
           },
           resourceId: "gid://gitlab/Project/25"
         },
       }
     ) {
       clientMutationId
       errors
     }
   }

7. Open LangSmith and go to the project you set up for tracing. You should see a new run for the /refactor call you just made
8. The ChatAnthropic section shows the compiled System prompt. Verify that the prompt includes the injected xray libraries!

Here are some examples:

• /refactor ➡️ https://smith.langchain.com/public/cc4abef2-ea4c-4fae-beaa-868051a26778/r
• /fix ➡️ https://smith.langchain.com/public/a0eb12f8-4146-4ea1-b6e5-6e708ad8b444/r
• /tests ➡️ https://smith.langchain.com/public/bceff713-62c7-4e12-82b6-dd01cc90f06b/r

Screenshots or screen recordings

See 👉 gitlab-org/gitlab!173750 (merged)

Merge request checklist

• Tests added for new functionality. If not, please raise an issue to follow up.
• Documentation added/updated, if needed.