The .parent property for /v1/project/{uuid} and /v1/project/lookup

### Current Behavior

The .parent property is documented in the JSON Schema, but it's missing from the Example.

It appears that getting project by UUID returns the .parent. Using lookup project doesn't return the .parent.
This is inconsistent.

### Expected Behavior

.parent is shown in example.

lookup-project returns .parent property as suggested by the JSON Schema.

### Dependency-Track Version

4.13.0

### Dependency-Track Distribution

Container Image

### Database Server

N/A

### Database Server Version

_No response_

### Browser

Mozilla Firefox

### 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 defect was already reported