Integration tests should be migrated to `jubilant`

[dariofaccin]

Context

Current integration tests are using pytest-operator to interact with Juju. It is recommended to migrate to Jubilant.

What needs to get done

1. Migrate integration tests to jubilant

Definition of Done

1. Integration tests are passing

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-8095.

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