onboarding: Remove accept AI ToS from within Zed (#36612)

Users now accept ToS from Zed's website when they sign in to Zed the
first time. So it's no longer possible that a signed in account could
not have accepted the ToS.


Release Notes:

- N/A

---------

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/agent_ui/src/active_thread.rs

@@ -1595,11 +1595,6 @@ impl ActiveThread {
             return;
         };
 
-        if model.provider.must_accept_terms(cx) {
-            cx.notify();
-            return;
-        }
-
         let edited_text = state.editor.read(cx).text(cx);
 
         let creases = state.editor.update(cx, extract_message_creases);