tests(twa): Replace istio in integration tests

[orfeas-k]

Context

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. However, kubeflow-tensorboards-webapp charm needs ingress relation in order to be unblocked and go to active. Thus, it should be replaced instead by a test entity that will be able mock that relation.

By removing istio, tests will also be independent of istio charms' failures.

What needs to get done

1. Remove istio from tensorboards-web-app
2. Replace it with a mock charm that offers ingress relation to charm

Definition of Done

Charm's integration tests pass without deploying istio charms

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5279.

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[orfeas-k]

We could also replace istio in the repo's integration tests.