Remove ACP feature flags (#38055)

This removes the `gemini-and-native` and `claude-code` feature flags.
Also, I removed a bunch of unused agent1 code that we do not need
anymore.

Initially I wanted to remove much more of the `agent` code, but noticed
some things that we need to figure out first:
- The inline assistant + context strip use `Thread`/`ContextStore`
directly
- We need some replacement for `ToolWorkingSet`, so we can access
available tools (as well as context server tools) in other places, e.g.
the agent configuration and the configure profile modal

Release Notes:

- N/A

crates/agent_settings/src/agent_profile.rs

@@ -1,9 +1,15 @@
 use std::sync::Arc;
 
 use collections::IndexMap;
-use gpui::SharedString;
+use convert_case::{Case, Casing as _};
+use fs::Fs;
+use gpui::{App, SharedString};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
+use settings::{Settings as _, update_settings_file};
+use util::ResultExt as _;
+
+use crate::AgentSettings;
 
 pub mod builtin_profiles {
     use super::AgentProfileId;
@@ -38,6 +44,69 @@ impl Default for AgentProfileId {
     }
 }
 
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct AgentProfile {
+    id: AgentProfileId,
+}
+
+pub type AvailableProfiles = IndexMap<AgentProfileId, SharedString>;
+
+impl AgentProfile {
+    pub fn new(id: AgentProfileId) -> Self {
+        Self { id }
+    }
+
+    pub fn id(&self) -> &AgentProfileId {
+        &self.id
+    }
+
+    /// Saves a new profile to the settings.
+    pub fn create(
+        name: String,
+        base_profile_id: Option<AgentProfileId>,
+        fs: Arc<dyn Fs>,
+        cx: &App,
+    ) -> AgentProfileId {
+        let id = AgentProfileId(name.to_case(Case::Kebab).into());
+
+        let base_profile =
+            base_profile_id.and_then(|id| AgentSettings::get_global(cx).profiles.get(&id).cloned());
+
+        let profile_settings = AgentProfileSettings {
+            name: name.into(),
+            tools: base_profile
+                .as_ref()
+                .map(|profile| profile.tools.clone())
+                .unwrap_or_default(),
+            enable_all_context_servers: base_profile
+                .as_ref()
+                .map(|profile| profile.enable_all_context_servers)
+                .unwrap_or_default(),
+            context_servers: base_profile
+                .map(|profile| profile.context_servers)
+                .unwrap_or_default(),
+        };
+
+        update_settings_file::<AgentSettings>(fs, cx, {
+            let id = id.clone();
+            move |settings, _cx| {
+                settings.create_profile(id, profile_settings).log_err();
+            }
+        });
+
+        id
+    }
+
+    /// Returns a map of AgentProfileIds to their names
+    pub fn available_profiles(cx: &App) -> AvailableProfiles {
+        let mut profiles = AvailableProfiles::default();
+        for (id, profile) in AgentSettings::get_global(cx).profiles.iter() {
+            profiles.insert(id.clone(), profile.name.clone());
+        }
+        profiles
+    }
+}
+
 /// A profile for the Zed Agent that controls its behavior.
 #[derive(Debug, Clone)]
 pub struct AgentProfileSettings {