rpc: Remove llm module in favor of zed_llm_client (#28900)

This PR removes the `llm` module of the `rpc` crate in favor of using
the types from the `zed_llm_client`.

Release Notes:

- N/A

crates/collab/Cargo.toml

@@ -75,6 +75,7 @@ tracing-subscriber = { version = "0.3.18", features = ["env-filter", "json", "re
 util.workspace = true
 uuid.workspace = true
 workspace-hack.workspace = true
+zed_llm_client.workspace = true
 
 [dev-dependencies]
 assistant = { workspace = true, features = ["test-support"] }

crates/collab/src/api/billing.rs

@@ -330,8 +330,10 @@ async fn create_billing_subscription(
                 .await?
         }
         None => {
-            let default_model =
-                llm_db.model(rpc::LanguageModelProvider::Anthropic, "claude-3-7-sonnet")?;
+            let default_model = llm_db.model(
+                zed_llm_client::LanguageModelProvider::Anthropic,
+                "claude-3-7-sonnet",
+            )?;
             let stripe_model = stripe_billing.register_model(default_model).await?;
             stripe_billing
                 .checkout(customer_id, &user.github_login, &stripe_model, &success_url)

crates/collab/src/llm/db.rs

@@ -8,9 +8,9 @@ mod tests;
 
 use collections::HashMap;
 pub use ids::*;
-use rpc::LanguageModelProvider;
 pub use seed::*;
 pub use tables::*;
+use zed_llm_client::LanguageModelProvider;
 
 #[cfg(test)]
 pub use tests::TestLlmDb;

crates/collab/src/llm/db/tests/provider_tests.rs

@@ -1,5 +1,5 @@
 use pretty_assertions::assert_eq;
-use rpc::LanguageModelProvider;
+use zed_llm_client::LanguageModelProvider;
 
 use crate::llm::db::LlmDatabase;
 use crate::test_llm_db;