Add priorityclass support

[kh3dron]

Requirements

• [x] I have added test coverage for new or changed functionality
• [x] I have followed the repository's pull request submission guidelines
• [x] I have validated my changes against all supported platform versions

Related issues

Issue Here.

Describe the solution you've provided

Let priorityClassName be passed into the deployment int he same way as other pod attributes, like annotations or labels.

Describe alternatives you've considered

No real alternatives considered - this should be a pretty minor addition.

Additional context

Issue backlink here.