Integration tests are missing for volume's workload

[ca-scribner]

See #27, #28

[orfeas-k]

Does this still stand? I see that there are some disabled tests in main but do we need them?

Although, not 100% relevant, we agreed in canonical/bundle-kubeflow#621 to test web apps using their unit/k8s-svc IP instead of going through Istio's ingress gateway. Thus, if we decide to keep those, we could change this too.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5272.

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[orfeas-k]

This is still relevant. There are no integration tests for the charm's workload.

[orfeas-k]

Instead of creating a new task, when tackling this one we should also take into account that during canonical/bundle-kubeflow#621, it was agreed to test web apps charms by using the unit/k8s-svc IP directly instead of going through istio's ingressgateway. Thus, we should remove istio charms from integration tests. By removing istio, tests will also be independent of istio charms' failures.