Replace zed_llm_client with cloud_llm_client (#35309)

This PR replaces the usage of the `zed_llm_client` with the
`cloud_llm_client`.

It was ported into this repo in #35307.

Release Notes:

- N/A

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

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