reducing ai context to imported files

[STetsing]

Only merge after #6164

Testing steps
Investigate code completion request payload with copilot activated

• On current live
  • open the network tab, do some coding and select the code completion/inserrtion request
  • add 1 or 2 different local files with contextual content
  • DO NOT import the local files in the current file in edit
• On this PR
  • Do some coding and check the logs
  • make sure at least 1 local file (not a library) is imported in the current file being edited
  • Only imported locales files are use to extend the prompt

At the end this PR will lower the request payload size significantly. Ideal test both case with the same inputs

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