Nested isCompact in Summary2

As a Service Owner I want to be able to customize what components will be shown as compact.

Context

Today we support setting isCompact like this:

```
{
"id": "MySummary2ID",
"type": "Summary2",
"target": {
"type": "component",
"id": "MyComponentID"
},
"isCompact": true,
"overrides": [
{
"componentId": "MyComponentID",
"displayType": "list"
},
{
"componentId": "MyComponentID2",
"displayType": "string"
}
],
}
```

This will set isCompact to the whole summary.
There is a need also be able to set isCompact for individual components, or exclkude isCompact for certian components.

We therefore suggest implementing isCompact in overrides like this:

```
{
"id": "MySummary2ID",
"type": "Summary2",
"target": {
"type": "component",
"id": "MyComponentID"
},
"isCompact": true,
"overrides": [
{
"componentId": "MyComponentID",
"displayType": "list",
"isCompact": false,
},
{
"componentId": "MyComponentID2",
"displayType": "string"
}
],
}
```

In this case, the override will supersede the component isCompact.

This means you could also set isCompact for a single component only:

```
{
"id": "MySummary2ID",
"type": "Summary2",
"target": {
"type": "component",
"id": "MyComponentID"
}
"overrides": [
{
"componentId": "MyComponentID",
"displayType": "list",
"isCompact": true,
},
{
"componentId": "MyComponentID2",
"displayType": "string"
}
],
}
```

Acceptance critereas

- [ ] Possible to set isCompact in overrides
- [ ] isCompact in override supersedes isCompact in component
- [ ] isCompact in component allows setting isCompact for individual components

Start by locating the Summary2 implementation and the handling of its overrides. Trace how component and summary-level isCompact values are resolved, then add coverage showing that override values take precedence and that individual components can set isCompact; done means all three acceptance criteria pass.

Written by the indexing model from the issue text.