genpolicy: add priorityClassName as a field in PodSpec interface

[arc9693]

Merge Checklist

• Followed patch format from upstream recommendation: https://github.com/kata-containers/community/blob/main/CONTRIBUTING.md#patch-format
• Included a single commit in a given PR - at least unless there are related commits and each makes sense as a change on its own.
• Aware about the PR to be merged using "create a merge commit" rather than "squash and merge" (or similar)
• genPolicy only: Ensured the tool still builds on Windows
• genPolicy only: Updated sample YAMLs' policy annotations, if applicable

Summary

Adds priorityClassName as a field in PodSpec interface.
This change allows generation of policy for pods specifying priority classes, which currently fails.

Associated issues

Links to CVEs

Test Methodology

Generated a policy for pod having priorityClassName and created the pod on K8s with kata-cc runtime.

[Redent0r]

Thank you @arc9693! To keep testing and ensure this functionality going forward, could you add a priorityClass to https://github.com/microsoft/kata-containers/blob/msft-main/src/agent/samples/policy/yaml/pod/pod-ubuntu.yaml or a simmilar existing yaml, update the annotation, and trigger a pipeline test run on this branch (https://dev.azure.com/mariner-org/mariner/_wiki/wikis/mariner.wiki/3368/Testing-genpolicy)?

[danmihai1]

Thank you @arc9693! To keep testing and ensure this functionality going forward, could you add a priorityClass to https://github.com/microsoft/kata-containers/blob/msft-main/src/agent/samples/policy/yaml/pod/pod-ubuntu.yaml or a simmilar existing yaml, update the annotation, and trigger a pipeline test run on this branch (https://dev.azure.com/mariner-org/mariner/_wiki/wikis/mariner.wiki/3368/Testing-genpolicy)?

Thanks for the reminder, Saul!

Archana, please keep the YAML file change in a separate commit. That should make upstreaming your change a bit easier for now - until we'll be ready to make these improvements directly upstream.

[arc9693]

Thank you @arc9693! To keep testing and ensure this functionality going forward, could you add a priorityClass to https://github.com/microsoft/kata-containers/blob/msft-main/src/agent/samples/policy/yaml/pod/pod-ubuntu.yaml or a simmilar existing yaml, update the annotation, and trigger a pipeline test run on this branch (https://dev.azure.com/mariner-org/mariner/_wiki/wikis/mariner.wiki/3368/Testing-genpolicy)?

I have updated the mentioned yaml, although there was no update in the annotation.
Triggered run: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=488443&view=results

[arc9693]

Updated the PriorityClass spec's api version. Triggered: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=493908&view=results. Tested in local.