Fix rejecting multiple hunks in AgentDiff (#28806)

Release Notes:

- Fixed a bug that caused `Reject All` to not always reject _all_ the
hunks.

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/agent/src/thread.rs

@@ -1801,14 +1801,14 @@ impl Thread {
             .update(cx, |action_log, cx| action_log.keep_all_edits(cx));
     }
 
-    pub fn reject_edits_in_range(
+    pub fn reject_edits_in_ranges(
         &mut self,
         buffer: Entity<language::Buffer>,
-        buffer_range: Range<language::Anchor>,
+        buffer_ranges: Vec<Range<language::Anchor>>,
         cx: &mut Context<Self>,
     ) -> Task<Result<()>> {
         self.action_log.update(cx, |action_log, cx| {
-            action_log.reject_edits_in_range(buffer, buffer_range, cx)
+            action_log.reject_edits_in_ranges(buffer, buffer_ranges, cx)
         })
     }