[UI] [GameScene] [PPMan/viz] Shows robot paths if hex grid is shown

Merge Request Template

Summary

Add back in hexagon path visualization

• Modifies GameScene to require PathPlannerManager in constructor
• Adds the plotPoints(int robotId, QVector<Hexagon*> hexPath) signal to PathPlannerManager
• Adds Grid const* const getGrid() to PathPlannerManager
• Modifies GameScene to get grid from PathPlannerManager and connect PathPlannerManager::plotPoints signal to GameScene::plotPoints slot

Testing

• Created tests
• Updated tests
• Tested in simulation (integration tests)
• Tested in real robot (if applicable)
• No tests (reason):

Screenshots/Videos

Related Issue(s)

Changes

Blast Radius

Checklist

• All relevant unit tests are passing
• Documentation updated (if applicable)
• No debug logs or commented-out code

Reviewer Notes

Part of #639