Timeseries: way to force show axis

### Discussed in https://github.com/grafana/grafana/discussions/68712 <div type='discussions-op-text'> ^{Originally posted by **simPod** May 18, 2023} I have few repeated Timeseries panels. Some contain series that is placed on second axis (right), some don't. That results in me having some panels with second axis shown and some without it which results in different graph width. For comparison Graph panel:  Timeseries panel:  I need a way to force enable the second axis so it's always present to pad the chart.</div>