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.

storage_controller/src/service/safekeeper_reconciler.rs

@@ -331,6 +331,7 @@ impl SafekeeperReconcilerInner {
                     http_hosts,
                     tenant_id: req.tenant_id,
                     timeline_id,
+                    ignore_tombstone: Some(false),
                 };
                 success = self
                     .reconcile_inner(