collab: Remove legacy claims from LLM token (#30294)

This PR removes some legacy claims related to the old billing from the
LLM token.

We already stopped reading this in the LLM Worker.

Also removed an outdated feature flag check that restricted access to
obtaining an LLM token.

Release Notes:

- N/A

crates/collab/src/rpc.rs

@@ -166,19 +166,6 @@ impl Session {
         }
     }
 
-    pub async fn has_llm_subscription(
-        &self,
-        db: &MutexGuard<'_, DbHandle>,
-    ) -> anyhow::Result<bool> {
-        if self.is_staff() {
-            return Ok(true);
-        }
-
-        let user_id = self.user_id();
-
-        Ok(db.has_active_billing_subscription(user_id).await?)
-    }
-
     pub async fn current_plan(&self, db: &MutexGuard<'_, DbHandle>) -> anyhow::Result<proto::Plan> {
         if self.is_staff() {
             return Ok(proto::Plan::ZedPro);
@@ -4000,11 +3987,6 @@ async fn get_llm_api_token(
     let db = session.db().await;
 
     let flags = db.get_user_flags(session.user_id()).await?;
-    let has_language_models_feature_flag = flags.iter().any(|flag| flag == "language-models");
-
-    if !session.is_staff() && !has_language_models_feature_flag {
-        Err(anyhow!("permission denied"))?
-    }
 
     let user_id = session.user_id();
     let user = db
@@ -4016,7 +3998,6 @@ async fn get_llm_api_token(
         Err(anyhow!("terms of service not accepted"))?
     }
 
-    let has_legacy_llm_subscription = session.has_llm_subscription(&db).await?;
     let billing_subscription = db.get_active_billing_subscription(user.id).await?;
     let billing_preferences = db.get_billing_preferences(user.id).await?;
 
@@ -4025,7 +4006,6 @@ async fn get_llm_api_token(
         session.is_staff(),
         billing_preferences,
         &flags,
-        has_legacy_llm_subscription,
         billing_subscription,
         session.system_id.clone(),
         &session.app_state.config,