Make editor::AcceptPartialCopilotSuggestion a deprecated alias (#35507)

This is consistent with there being no copilot expecific variant of
`editor::AcceptEditPrediction`. It also fixes a case where the
`disable_ai: true` has effects at init time that aren't undone when
changed, added in #35327.

Release Notes:

- N/A

crates/editor/src/actions.rs

@@ -315,9 +315,8 @@ actions!(
     [
         /// Accepts the full edit prediction.
         AcceptEditPrediction,
-        /// Accepts a partial Copilot suggestion.
-        AcceptPartialCopilotSuggestion,
         /// Accepts a partial edit prediction.
+        #[action(deprecated_aliases = ["editor::AcceptPartialCopilotSuggestion"])]
         AcceptPartialEditPrediction,
         /// Adds a cursor above the current selection.
         AddSelectionAbove,