refactor: Remove code suggestion api key configuration

refactor: Remove code suggestion api key configuration

We use API key for the extension on a Gitlab repo.

Main issue: https://gitlab.com/gitlab-org/modelops/applied-ml/ai-assist/ai-assist-api/-/issues/10

Screenshots

Before	After

Manual test

Code completion works fine in VsCode development mode

console.log("Hello");

console.log("hello");

// create a vue component
let Vue = require('vue');

// create a new instance of vue
let app = new Vue({
    el:
</div>