Add OpenAI o3-mini support (#24044)

Release Notes:

- Add support for OpenAI o3-mini

crates/language_model/src/model/cloud_model.rs

@@ -82,6 +82,7 @@ impl CloudModel {
                 | open_ai::Model::O1Mini
                 | open_ai::Model::O1Preview
                 | open_ai::Model::O1
+                | open_ai::Model::O3Mini
                 | open_ai::Model::Custom { .. } => {
                     LanguageModelAvailability::RequiresPlan(Plan::ZedPro)
                 }