Fix edit prediction disablement with "disable_ai": true setting (#35513)

Even after #35327 edit predictions were still being queried and shown
after setting `"disable_ai": true`

Also moves `DisableAiSettings` to the `project` crate so that it gets
included in tests via existing use of `Project::init_settings(cx)`.

Release Notes:

- Fixed `"disable_ai": true` setting disabling edit predictions.

crates/copilot/src/copilot.rs

@@ -6,7 +6,6 @@ mod sign_in;
 use crate::sign_in::initiate_sign_in_within_workspace;
 use ::fs::Fs;
 use anyhow::{Context as _, Result, anyhow};
-use client::DisableAiSettings;
 use collections::{HashMap, HashSet};
 use command_palette_hooks::CommandPaletteFilter;
 use futures::{Future, FutureExt, TryFutureExt, channel::oneshot, future::Shared};
@@ -24,6 +23,7 @@ use language::{
 use lsp::{LanguageServer, LanguageServerBinary, LanguageServerId, LanguageServerName};
 use node_runtime::NodeRuntime;
 use parking_lot::Mutex;
+use project::DisableAiSettings;
 use request::StatusNotification;
 use serde_json::json;
 use settings::Settings;