Enable Fireworks/Codestral by default for code completion

Allen Cookrequested to merge
enable_use_fireworks_codestral_code_completion_default into master

What does this MR do and why?

Enables Fireworks/Codestral by default for code completion

References

How to set up and validate locally

curl -X "POST" "http://gdk.test:3000/api/v4/code_suggestions/completions" \
     -H 'Content-Type: application/json' \
     -H 'Authorization: Bearer AUTH_TOKEN' \
     -d $'{
  "prompt_version": 2,
  "current_file": {
    "file_name": "test.go",
    "content_above_cursor": "// write a function that parses a .env file",
    "content_below_cursor": "//end function"
  },
  "intent": "completion"
}'

Should use fireworks_ai/codestral-2501 as the model

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