Performance: Reduce over-fetching for Project Lists children

### Current Behavior

For large datasets, which have parent -> children relationships, the `Project Lists` view can take quite a long time to respond, particularly when fetching children objects (query parameter `onlyRoot=true`)

When inspecting the JSON response, there are quite a number of fields that are not required for the Project Lists paginated view to be rendered.

### Proposed Behavior

Optimize the response object so that only required fields are retrieved

### Checklist

- [X] I have read and understand the [contributing guidelines](https://github.com/DependencyTrack/dependency-track/blob/master/CONTRIBUTING.md#filing-issues)
- [X] I have checked the [existing issues](https://github.com/DependencyTrack/dependency-track/issues) for whether this enhancement was already requested