Update end to end test to use podman-py

[Jennifer Power]

Is your feature request related to a problem? Please describe.

The end to end tests are using sub processes to interact with podman.

Describe the solution you'd like

Use the podman-py lib - https://github.com/containers/podman-py

Describe alternatives you've considered

Additional context

Location - https://github.com/RedHatProductSecurity/trestle-bot/tree/main/tests/e2e