Potential sync service crash after restarting container and modifying row tracked by shape using subquery

**Versions**

- Client: HTTP
- Electric: 1.2.9

**Bug description**
When I stop the container running the sync service and restart it, modifying rows belonging to non-subquery using shapes has them properly picked up. But when I modify a row that should be picked up by a shape that uses a subquery, the service crashes with the error:

```
01:42:10.092 pid=<0.3457.0> [error] GenServer {:"Electric.ProcessRegistry:single_stack", {Electric.Replication.ShapeLogCollector, nil}} terminating
** (stop) exited in: GenServer.call({:via, Registry, {:"Electric.ProcessRegistry:single_stack", {Electric.Shapes.Consumer.Materializer, "43228226-1772242656181490"}}}, :get_link_values, 5000)
** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started
(elixir 1.19.1) lib/gen_server.ex:1135: GenServer.call/3
(electric 1.2.9) lib/electric/shapes/consumer/materializer.ex:65: anonymous fn/2 in Electric.Shapes.Consumer.Materializer.get_all_as_refs/2
(elixir 1.19.1) lib/enum.ex:1688: Enum."-map/2-lists^map/1-1-"/2
(elixir 1.19.1) lib/map.ex:267: Map.new_from_enum/2
(electric 1.2.9) lib/electric/shapes/filter/where_condition.ex:210: anonymous fn/6 in Electric.Shapes.Filter.WhereCondition.other_shapes_affected/4
(stdlib 7.1) maps.erl:894: :maps.fold_1/4
(electric 1.2.9) lib/electric/shapes/filter/where_condition.ex:208: anonymous fn/4 in Electric.Shapes.Filter.WhereCondition.other_shapes_affected/4
(electric 1.2.9) lib/electric/telemetry/open_telemetry.ex:89: anonymous fn/5 in Electric.Telemetry.OpenTelemetry.do_with_span/5
(telemetry 1.3.0) /builder/electric/deps/telemetry/src/telemetry.erl:324: :telemetry.span/3
(electric 1.2.9) lib/electric/shapes/filter/where_condition.ex:170: Electric.Shapes.Filter.WhereCondition.affected_shapes/3
(electric 1.2.9) lib/electric/shapes/filter.ex:123: anonymous fn/2 in Electric.Shapes.Filter.affected_shapes/2
(stdlib 7.1) timer.erl:599: :timer.tc/2
(electric 1.2.9) lib/electric/telemetry/open_telemetry.ex:134: Electric.Telemetry.OpenTelemetry.timed_fun/3
(electric 1.2.9) lib/electric/shapes/event_router.ex:149: Electric.Shapes.EventRouter.find_affected_shapes_for_change/2
(electric 1.2.9) lib/electric/shapes/event_router.ex:106: Electric.Shapes.EventRouter.route_change/3
(elixir 1.19.1) lib/enum.ex:2520: Enum."-reduce/3-lists^foldl/2-0-"/3
(electric 1.2.9) lib/electric/shapes/event_router.ex:83: Electric.Shapes.EventRouter.event_by_shape_handle/2
(electric 1.2.9) lib/electric/replication/shape_log_collector.ex:508: Electric.Replication.ShapeLogCollector.publish/2
(electric 1.2.9) lib/electric/replication/shape_log_collector.ex:495: Electric.Replication.ShapeLogCollector.handle_txn_fragment/2
(electric 1.2.9) lib/electric/replication/shape_log_collector.ex:431: anonymous fn/2 in Electric.Replication.ShapeLogCollector.do_handle_event/2
(electric 1.2.9) lib/electric/telemetry/open_telemetry.ex:89: anonymous fn/5 in Electric.Telemetry.OpenTelemetry.do_with_span/5
(telemetry 1.3.0) /builder/electric/deps/telemetry/src/telemetry.erl:324: :telemetry.span/3
(electric 1.2.9) lib/electric/replication/shape_log_collector.ex:289: Electric.Replication.ShapeLogCollector.handle_call/3
(stdlib 7.1) gen_server.erl:2470: :gen_server.try_handle_call/4
(stdlib 7.1) gen_server.erl:2499: :gen_server.handle_msg/3
(stdlib 7.1) proc_lib.erl:333: :proc_lib.init_p_do_apply/3
Process Label: {:shape_log_collector, "single_stack"}
Last message (from #PID<0.3263.0>): {:handle_event, %Electric.Replication.Changes.TransactionFragment{xid: 51714091, lsn: #Lsn, last_log_offset: LogOffset.new(50583975088, 0), has_begin?: true, commit: %Electric.Replication.Changes.Commit{commit_timestamp: ~U[2026-02-28 01:42:09.788213Z], transaction_size: 113, txn_change_count: 1}, changes: [%Electric.Replication.Changes.DeletedRecord{relation: {"", ""}, old_record: %{......}, log_offset: LogOffset.new(50583975088, 0), key: nil, move_tags: [], last?: false}], affected_relations: MapSet.new([{"", ""}]), change_count: 1}, {:undefined, %{}}}
```

**Expected behavior**
Expected behavior is to sync that change without crashing.