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/zeta/src/init.rs

@@ -1,10 +1,10 @@
 use std::any::{Any, TypeId};
 
-use client::DisableAiSettings;
 use command_palette_hooks::CommandPaletteFilter;
 use feature_flags::{FeatureFlagAppExt as _, PredictEditsRateCompletionsFeatureFlag};
 use gpui::actions;
 use language::language_settings::{AllLanguageSettings, EditPredictionProvider};
+use project::DisableAiSettings;
 use settings::{Settings, SettingsStore, update_settings_file};
 use ui::App;
 use workspace::Workspace;