archival: Disable housekeeping jobs on startup

When the archiver is created there is a small window of opportunity for
it to run some housekeeping jobs before the manifest is synced. This
commit disables the housekeeping jobs in the contstructor to avoid this.

(cherry picked from commit d4735bc)

src/v/archival/ntp_archiver_service.cc

@@ -239,6 +239,13 @@ ntp_archiver::ntp_archiver(
         _next_housekeeping = _housekeeping_jitter();
     });
 
+    if (_local_segment_merger) {
+        _local_segment_merger->set_enabled(false);
+    }
+    if (_scrubber) {
+        _scrubber->set_enabled(false);
+    }
+
     _start_term = _parent.term();
     // Override bucket for read-replica
     if (_parent.is_read_replica_mode_enabled()) {