pull_timeline: check tombstones by default (#11873)

Make `pull_timeline` check tombstones by default. Otherwise, we'd be
recreating timelines if the order between creation and deletion got
mixed up, as seen in #11838.

Fixes #11838.

libs/safekeeper_api/src/models.rs

@@ -299,6 +299,7 @@ pub struct PullTimelineRequest {
     pub tenant_id: TenantId,
     pub timeline_id: TimelineId,
     pub http_hosts: Vec<String>,
+    pub ignore_tombstone: Option<bool>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]