Add support for OpenAI o3 and o4-mini models (#28881)

Release Notes:

- Add support for OpenAI o3 and o4-mini models via OpenAI API and
Copilot Chat providers.

---------

Co-authored-by: Peter Tripp <peter@zed.dev>

crates/language_model/src/model/cloud_model.rs

@@ -90,6 +90,8 @@ impl CloudModel {
                 | open_ai::Model::O1Preview
                 | open_ai::Model::O1
                 | open_ai::Model::O3Mini
+                | open_ai::Model::O3
+                | open_ai::Model::O4Mini
                 | open_ai::Model::Custom { .. } => {
                     LanguageModelAvailability::RequiresPlan(Plan::ZedPro)
                 }