Enable users to list content within container-push repository types

The feature request could be relevant only to pulp_container.

In pulp_container, I want to be able to list content available in a push-repository.

This works:

pulp container repository create --name test123321
pulp container repository content list --repository test123321

This does not work:

podman pull ghcr.io/pulp/hello-world
podman tag ghcr.io/pulp/hello-world localhost:24817/pulp/hello-world
podman push localhost:24817/pulp/hello-world --tls-verify=false
pulp container repository --type push content list --repository pulp/hello-world

We might be required to override the behaviour of the repository-content command in order to disable the "content-add" and "content-remove" capabilities along with changing the value passed to the allowed_with_contexts parameter (https://github.com/pulp/pulp-cli/blob/bd521c10adcca1d281cf42c883623e30ecd1b6b3/pulpcore/cli/container/repository.py#L142).

Reproduce the working and failing commands for pulp_container in the issue, then read pulpcore/cli/container/repository.py around line 142 and the repository-content command behavior. Done means content listing works for a container push repository while the unsupported content-add and content-remove capabilities remain disabled.