Display when updated version are available in Dependency Graph

### Current Behavior

On the Components view we have the convenient flag to say when a newer version is available.
Most Components are transitive and much as we might like to update them, we don't have any easy way to do so.
Nowhere in the UI is there a way to see all the direct dependencies along with a highlight of the ones that we can update.

### Proposed Behavior

I can see two ways the UI could be enhanced to provide this information:
1. Have a flag on the Components view to only show direct dependencies of the project.
2. Put the version flag onto the Dependency Graph.

I would prefer not to have the green triangle (anywhere - I don't think an OK symbol should ever be a triangle with an exclamation mark in it, and the colours chosen are not helpful for green/yellow colour blindness).

### 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/frontend/issues) for whether this enhancement was already requested