ui-template support for "Reload last value on refresh"

### Description

Saw the `script` support was added, thank you!

The old dashboard templates had an options, "Reload last value on refresh". I believe this replayed the last `msg`, as all JS events defined in the template would get refired. This is useful to load an initial state for widgets. I am not sure how you are storing state like this across the nodes, but imagine all nodes actually would benefit from this generically to set initial states... if so, widen to include ALL controls? 😄

### Have you provided an initial effort estimate for this issue?

I am no FlowFuse team member